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+[/Creator (html2ps version 1.0 beta5) /Author () /Keywords (xsd, xml, schema, c++, mapping, data, binding, parsing, serialization, validation) /Subject ()
+ /Title (C++/Tree Mapping Getting Started Guide) /DOCINFO pdfmark
+/ND 1 D
+/HN [(1) (1) (1) (1) (1) (1) (1) (2) (2) (3) (3) (5) (6) (7) (8) (11) (13) (15)
+(16) (16) (16) (17) (17) (20) (22) (24) (26) (29) (??) (31) (32) (34) (36)
+(37) (38) (1) (1) (1) (1) (2) (2) (3) (3) (5) (6) (7) (8) (11) (13) (15)
+(16) (16) (16) (17) (17) (20) (22) (24) (26) (29) (31) (32) (34) (36) (37)
+(38)] D
+/h0 [()(Table of Contents)] D
+/h1 [(1\240\240)(Preface)] D
+/h2 [(1.1\240\240)(About This Document)] D
+/h3 [(1.2\240\240)(More Information)] D
+/h4 [(2\240\240)(1 Introduction)] D
+/h5 [(2.1\240\240)(1.1 Mapping Overview)] D
+/h6 [(2.2\240\240)(1.2 Benefits)] D
+/h7 [(3\240\240)(2 Hello World Example)] D
+/h8 [(3.1\240\240)(2.1 Writing XML Document and Schema)] D
+/h9 [(3.2\240\240)(2.2 Translating Schema to C++)] D
+/h10 [(3.3\240\240)(2.3 Implementing Application Logic)] D
+/h11 [(3.4\240\240)(2.4 Compiling and Running)] D
+/h12 [(3.5\240\240)(2.5 Adding Serialization)] D
+/h13 [(3.6\240\240)(2.6 Selecting Naming Convention)] D
+/h14 [(3.7\240\240)(2.7 Generating Documentation)] D
+/h15 [(4\240\240)(3 Overall Mapping Configuration)] D
+/h16 [(4.1\240\240)(3.1 Character Type and Encoding)] D
+/h17 [(4.2\240\240)(3.2 Support for Polymorphism)] D
+/h18 [(4.3\240\240)(3.3 Namespace Mapping)] D
+/h19 [(4.4\240\240)(3.4 Thread Safety)] D
+/h20 [(5\240\240)(4 Working with Object Models)] D
+/h21 [(5.1\240\240)(4.1 Attribute and Element Cardinalities)] D
+/h22 [(5.2\240\240)(4.2 Accessing the Object Model)] D
+/h23 [(5.3\240\240)(4.3 Modifying the Object Model)] D
+/h24 [(5.4\240\240)(4.4 Creating the Object Model from Scratch)] D
+/h25 [(5.5\240\240)(4.5 Mapping for the Built-in XML Schema Types)] D
+/h26 [(6\240\240)(5 Parsing)] D
+/h27 [(6.1\240\240)(5.1 XML Schema Validation and Searching)] D
+/h28 [(6.2\240\240)(5.2 Error Handling)] D
+/h29 [(7\240\240)(6 Serialization)] D
+/h30 [(7.1\240\240)(6.1 Namespace and Schema Information)] D
+/h31 [(7.2\240\240)(6.2 Error Handling)] D
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+ 0 0 M /LM 0 D proc exec BN
+ AT 4 eq{
+ LN array astore cell 15 3 -1 roll put
+ cdesc icol get dup dup 5 get M1 lt{5 M1 put}{5 get /M1 E D}ie
+ dup 6 get M2 lt{6 M2 put}{6 get /M2 E D}ie
+ /LM M1 M2 add D
+ }if
+ /CD f D
+ ang 0 ne{/LM CP E pop neg D}if
+ /thiswid LM left add right add eps add D
+ /oldmin 0 D /oldmax 0 D
+ 0 1 cspan 1 sub{
+ icol add cdesc E get dup 2 get /oldmax E oldmax add D
+ 1 get /oldmin E oldmin add D
+ }for
+ thiswid oldmax ge{
+ 0 1 cspan 1 sub{
+ icol add cdesc E get dup 2 E 2 get oldmax 0 eq
+ {pop thiswid cspan div}{thiswid mul oldmax div}ie
+ put
+ }for
+ }if
+ nowrap 1 eq{
+ thiswid oldmin ge{
+ 0 1 cspan 1 sub{
+ icol add cdesc E get dup 1 E 1 get oldmin 0 eq
+ {pop thiswid cspan div}{thiswid mul oldmin div}ie
+ put
+ }for
+ }if
+ }{
+ /W 0 D /LL W D /PH 2 D
+ ctype 1 eq{() ES () BD}if
+ 0 0 M /LM 0 D RC proc exec BN
+ /thiswid LM left add right add eps add D
+ thiswid oldmin ge{
+ 0 1 cspan 1 sub{
+ icol add cdesc E get dup 1 E 1 get oldmin 0 eq
+ {pop thiswid cspan div}{thiswid mul oldmin div}ie
+ put
+ }for
+ }if
+ }ie
+ ctype 1 eq{() ES}if
+ }if
+ }if
+ }for
+ }for
+ }for
+ /tmin 0 D /tmax 0 D
+ 0 1 ncol{
+ cdesc E get dup 1 get E 2 get 2 copy gt{pop dup}if
+ tmax add /tmax E D tmin add /tmin E D
+ }for
+ twid 0 lt{twid neg IW gt{IW neg}{twid}ie /twid E D}if
+ tdesc 0 twid neg tmin 2 copy lt{E}if pop put
+ tdesc 1 twid neg tmax 2 copy lt{E}if pop put
+ /W w D /LL W D /OU t D /PH 0 D /PL 0 D
+} D
+/PT {
+ /PL PL 1 add D
+ tables E get /table E D Tm 21 get Ts mul BE
+ PL 2 ge{save}if
+ /SL SL 1 add D /FN EF 21 get D EZ 21 get Ey 21 get FS
+ table aload pop /rdesc E D /cdesc E D /tdesc E D
+ tdesc aload pop /capalg E D /caption E D /rules E D /frame E D /nfoot E D
+ /nhead E D /ncol E D /nrow E D /border E D /twid E D /units E D /talign E D
+ /flow E D /clear E D /tclass E D /tmax E D /tmin E D
+ /w W D /xo XO D /mr MR D /ll LL D /lg LG D /ai AI D /bc BC D /nr NR D /ar AR D
+ /tr TR D /ui UI D /ph PH D /a0 A0 D /pf PF D /at AT D /av AV D /al AL D
+ /Le LE D /la La D
+ talign 0 lt{/talign AL 0 gt{AV AL get}{A0 2 le{A0}{0}ie}ie D}if
+ ph 1 eq ph 2 eq or{
+ NL ph 1 eq{tmax}{tmin}ie dup XO add LM gt{/LM E XO add D}{pop}ie LM E
+ }{
+ /PH 3 D /LE 1e5 D RC %ZF
+ border 0 gt{/border 1 D}if
+ /twidth 0 D /avail W xo sub D
+ twid 0 eq{0 1 ncol{cdesc E get dup 2 get E 3 get dup 0 gt{div neg dup twid lt
+ {/twid E D}{pop}ie}{pop pop}ie}for}if
+ /twid twid dup 0 lt{neg avail 2 copy gt{E}if pop}{avail mul}ie D
+ /OK t D 0 1 ncol{cdesc E get dup 1 get E 3 get twid mul gt{/OK f D}if}for
+ 0 1 ncol{
+ cdesc E get dup 1 get /colmin E D dup 3 get /cwid E twid mul D dup
+ tmax avail le{2 get}if
+ tmin avail le tmax avail gt and{
+ dup 2 get E 1 get dup 3 1 roll sub avail tmin sub mul tmax tmin sub div add
+ }if
+ tmin avail gt{1 get}if
+ 0 E colmin cwid lt OK and{pop cwid}if dup /twidth E twidth add D put
+ }for
+ /OU f D CP
+ tmin twid le{
+ 0 1 ncol{cdesc E get dup 0 get twidth div twid mul 0 E put}for
+ /twidth twid D
+ }if
+ CP printcap CP E pop sub /caphig E D pop
+ 0 1 1{
+ /pass E D
+ 0 1 nrow{
+ /irow E D
+ /cells rdesc irow get 6 get D
+ 0 1 ncol{
+ /icol E D
+ /cell cells icol get D
+ cell 0 ne{
+ cell aload pop /ang E D /CB E D pop pop pop
+ /DV E D /bot E D /top E D /right E D /left E D /nowrap E D /valign E D
+ /dp E D /align E D /rspan E D /cspan E D /cclass E D /ctype E D /cmax E D
+ /cmin E D /proc E D
+ rspan 0 eq{/rspan nrow irow sub 1 add D}if
+ cspan 0 eq{/cspan ncol icol sub 1 add D}if
+ /W 0 D
+ 0 1 cspan 1 sub{icol add cdesc E get 0 get /W E W add D}for
+ pass 0 eq rspan 1 eq and pass 1 eq rspan 1 gt and or{
+ ctype 1 eq{() BD}if
+ /W W left sub right sub D /XO 0 D /EO 0 D SI
+ /A0 align D RC align NA
+ AT 4 eq{
+ /DC dp D /DO 0 D /ID 1 D
+ 0 1 DV length 1 sub{DV E get dup DO gt{/DO E D}{pop}ie}for
+ /Lo DO DV 0 get sub D /L1 Lo D
+ }if
+ 0 0 M /BP t D /Fl t D /MF 0 D /FB 0 D
+ proc exec T not{/CI 0 D}if BN 0 FB neg R MF 0 eq{/MF CS D}if
+ CP /thishig E neg bot add top add CI add D pop
+ ang 0 ne{/thishig LM bot add top add D}if
+ cell 16 MF put cell 17 Ya put cell 18 thishig put
+ valign 4 eq{
+ /below thishig Ya sub D
+ rdesc irow get dup dup 4 get Ya lt
+ {4 Ya put}{4 get /Ya E D}ie
+ dup 5 get below lt{5 below put}{5 get /below E D}ie
+ /thishig Ya below add D
+ }if
+ ctype 1 eq{()ES}if
+ /oldhig 0 D
+ 0 1 rspan 1 sub{
+ irow add rdesc E get 0 get /oldhig E oldhig add D
+ }for
+ thishig oldhig ge{
+ 0 1 rspan 1 sub{
+ irow add rdesc E get dup 0 E 0 get oldhig 0 eq
+ {pop thishig rspan div}{thishig mul oldhig div}ie
+ put
+ }for
+ }if
+ }if
+ }if
+ }for
+ }for
+ }for M RC %ZF
+ /thight 0 D /racc 0 D /maxh 0 D /brk 0 D /rbeg nhead nfoot add D
+ 0 1 nrow{
+ rdesc E get dup 0 get dup /thight E thight add D
+ brk 0 eq{/racc E D}{/racc E racc add D}ie
+ racc maxh gt{/maxh racc D}if 2 get /brk E D
+ }for
+ ph 3 ge{thight caphig add E}if
+ ph 0 eq ph 4 eq or{
+ /PH 4 D /LE Le D /OU Ou D /yoff 0 D /headsz 0 D
+ 0 1 nhead 1 sub{rdesc E get 0 get headsz add /headsz E D}for
+ /footsz 0 D
+ 0 1 nfoot 1 sub{rdesc E nhead add get 0 get footsz add /footsz E D}for
+ /ahig LE BO add MI add D /maxh maxh headsz add footsz add D
+ /thight thight headsz add footsz add D
+ tmin avail gt maxh ahig gt or
+ {/Sf avail tmin div dup ahig maxh div gt{pop ahig maxh div}if D /SA t D}
+ {/Sf 1 D}ie
+ tclass 1 eq thight LE 15 sub gt and
+ {/SA t D LE 15 sub thight div dup Sf lt{/Sf E D}{pop}ie}if
+ SA{Sf Sf scale /ll ll Sf div D /xo xo Sf div D /LE LE Sf div D
+ /mr mr Sf div D /BO BO Sf div D /ahig ahig Sf div D}if
+ nhead nfoot add getwid
+ LE CP E pop add capalg 0 eq{caphig sub}if
+ bT{f}{dup thight lt thight ahig lt and}ie
+ E headsz sub footsz sub rwid lt or{NP}if
+ capalg 0 eq{printcap -8 SP}if
+ CP /ycur E D pop
+ printhead
+ rbeg 1 nrow{/row E D row
+ getwid
+ ycur yoff add rwid sub footsz sub LE add 0 lt
+ {nfoot 0 gt{printfoot}if Tf NP /rbeg irow1 D
+ Ba{MI /MI MI SA{Sf div}if D MI SP /MI E D}if
+ CP /ycur E D pop /yoff 0 D printhead}if
+ irow1 printrow
+ }for
+ printfoot /row row 1 add D Tf
+ 0 ycur yoff add M
+ capalg 1 eq{/EO 0 D SI -3 SP printcap}if
+ Sf 1 lt{1 Sf div dup scale /ll ll Sf mul D /xo xo Sf mul D /LE LE Sf mul D
+ /mr mr Sf mul D /BO BO Sf mul D /SA f D}if
+ /EO 0 D
+ }if
+ }ie
+ /W w D /XO xo D /MR mr D /LL ll D /LG lg D /AI ai D /BC bc D /NR nr D /AR ar D
+ /TR tr D /UI ui D /PH ph D /A0 a0 D /PF pf D /AT at D /AV av D /AL al D
+ /La la D
+ /SL SL 1 sub NN D /CF 0 D /FN 0 D SZ SL get FR SL get FS Wf not{()F2}if
+ PL 2 ge{Ms E restore Ms or /Ms E D PH 1 eq PH 2 eq or
+ {/LM E D}if PH 3 ge{/CI 0 D NL 0 E neg R}if
+ }if
+ /PL PL 1 sub D /CI 0 D /BP f D /PO f D () Bm 21 get Ts mul BE BL %CF CS SF
+} D
+/printcap{
+ capalg 0 ge{
+ SA{/W w Sf div D}
+ {talign 1 eq{/XO xo ll twidth sub 2 div add D}if
+ talign 2 eq{/XO xo ll twidth sub add D}if
+ /W XO twidth add D
+ }ie /XO xo D /LL W XO sub MR sub D
+ /PA f D /Fl capalg 0 eq D
+ 1 NA BL caption exec BN OA /PA t D
+ }if
+} D
+/getwid{
+ /irow1 E D
+ /irow2 irow1 D
+ /rwid 0 D
+ {rdesc irow2 get dup 0 get rwid add /rwid E D 2 get 0 eq
+ {exit}{/irow2 irow2 1 add D}ie
+ }loop
+} D
+/printrow{
+ /xoff ll twidth PL 2 ge{Sf div}if sub talign mul 2 div D
+ /xleft xoff xo add D
+ /irow E D
+ /cells rdesc irow get 6 get D
+ 0 1 ncol{
+ /icol E D
+ /cell cells icol get D
+ cell 0 ne{
+ cell aload pop /ang E D /CB E D /cvsize E D /above E D /fontsz E D
+ /DV E D /bot E D /top E D /right E D /left E D /nowrap E D /valign E D
+ /dp E D /align E D /rspan E D /cspan E D /cclass E D /ctype E D /cmax E D
+ /cmin E D /proc E D
+ rspan 0 eq{/rspan nrow irow sub 1 add D}if
+ cspan 0 eq{/cspan ncol icol sub 1 add D}if
+ /width 0 D
+ 0 1 cspan 1 sub{icol add cdesc E get 0 get /width E width add D}for
+ /rhight rdesc irow get 0 get D
+ /hight rhight D
+ 1 1 rspan 1 sub{irow add rdesc E get 0 get /hight E hight add D}for
+ /W xo xoff add width add right sub D
+ ang 0 ne{/W xo xoff add hight add right sub D}if
+ /EO xo xoff add left add D SI
+ Cf{
+ gsave CB VC xo xoff add ycur yoff add M
+ 0 hight neg RL width 0 RL 0 hight RL width neg 0 RL fill
+ grestore
+ }if
+ ctype 1 eq{() BD}if
+ /A0 align D RC
+ AT 4 eq{
+ /DC dp D /ID 1 D /DO cdesc icol get 5 get D /Lo DO DV 0 get sub D /L1 Lo D
+ }if
+ ang 0 ne{
+ gsave ang 90 eq
+ {xoff ycur add hight cvsize sub 2 div sub ycur hight sub xoff sub}
+ {xoff ycur sub width add hight cvsize sub 2 div add ycur xoff add}ie
+ translate ang rotate
+ }if
+ valign 3 le{0 ycur yoff add top sub
+ hight cvsize sub valign 1 sub mul 2 div sub M}
+ {0 ycur yoff add top sub above add rdesc irow get 4 get sub M}ie
+ /PA f D /BP t D /Fl t D
+ BL proc exec BN
+ ang 0 ne{grestore}if
+ /PA t D
+ ctype 1 eq{() ES}if
+ }if
+ /xoff xoff cdesc icol get 0 get add D
+ }for
+ /yoff yoff rhight sub D
+} D
+/printhead {0 1 nhead 1 sub{printrow}for} D
+/printfoot {nhead 1 nhead nfoot add 1 sub{printrow}for} D
+/Tf {
+ OU{rules 2 ge{/yoff 0 D
+ gsave 0 Sg
+ [0 1 nhead 1 sub{}for rbeg 1 row 1 sub{}for nhead 1 nhead nfoot add 1 sub{}for]{
+ /irow E D
+ /xoff ll twidth PL 2 ge{Sf div}if sub talign mul 2 div D
+ /cells rdesc irow get 6 get D
+ 0 1 ncol{
+ /icol E D
+ /cell cells icol get D
+ cell 0 ne{
+ /rspan cell 6 get D
+ /cspan cell 5 get D
+ rspan 0 eq{/rspan nrow irow sub 1 add D}if
+ cspan 0 eq{/cspan ncol icol sub 1 add D}if
+ /width 0 D
+ 0 1 cspan 1 sub{icol add cdesc E get 0 get /width E width add D}for
+ /rhight rdesc irow get 0 get D
+ /hight rhight D
+ 1 1 rspan 1 sub{irow add rdesc E get 0 get /hight E hight add D}for
+ xo xoff add width add ycur yoff add M
+ 0 hight neg icol cspan add 1 sub ncol lt
+ {cdesc icol 1 add get 4 get dup rules 3 le{1 eq}{pop t}ie
+ {1 eq{0.8}{0.3}ie
+ LW RL CP stroke M}{pop R}ie}{R}ie
+ irow nhead nfoot add 1 sub ne nfoot 0 eq or
+ {irow rspan add 1 sub nrow lt
+ {rdesc irow rspan add get 3 get}{nfoot 0 eq{0}{1}ie}ie
+ dup rules 2 mod 0 eq{1 eq}{pop t}ie
+ {1 eq irow rspan add nhead eq or irow rspan add row eq nfoot 0 gt and or
+ {0.8}{0.3}ie LW width neg 0 RL CP stroke M}{pop}ie}if
+ }if
+ /xoff xoff cdesc icol get 0 get add D
+ }for
+ /yoff yoff rhight sub D
+ }forall
+ grestore
+ /Ms t D
+ }if
+ frame 1 gt{
+ gsave
+ 1 LW 0 Sg
+ xleft ycur M CP BB
+ 0 yoff frame 5 eq frame 7 ge or{RL}{R}ie
+ twidth 0 frame 3 eq frame 4 eq or frame 8 ge or{RL}{R}ie CP BB
+ 0 yoff neg frame 6 ge{RL}{R}ie
+ twidth neg 0 frame 2 eq frame 4 eq or frame 8 ge or{RL}{R}ie
+ closepath stroke
+ grestore
+ /Ms t D
+ }if
+ }if
+} D
+/tables [[[0 0 0 0 0 -1 0 0 1 55 2 0 0 9 5 {()} -1]
+ [[0 0 0 0 0 0 0][0 0 0 0 0 0 0][0 0 0 0 0 0 0]]
+ [[0 0 0 0 0 0 [[{()1 Sl()WB(XML Schema type)} 0 0 1 0 1 1 1 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB(Alias in the )SM(xml_schema)ES( names)HY(pace)YH()} 0 0 1 0 1 1 1 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB(C++ type
+ )} 0 0 1 0 1 1 1 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB(fixed-length inte)HY(gral)YH( types
+ )} 0 0 1 0 3 1 1 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+0
+0
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(byte)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(byte)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(signed\240char)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(unsigned)HY(Byte)YH()ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(unsigned_byte)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(unsigned\240char)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(short)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(short_)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(short)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(unsigned)HY(Short)YH()ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(unsigned_short)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(unsigned\240short)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(int)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(int_)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(int)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(unsignedInt)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(unsigned_int)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(unsigned\240int)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(long)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(long_)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(long\240long)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(unsigned)HY(Long)YH()ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(unsigned_long)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(unsigned\240long\240long)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB(arbi)HY(trary)YH(-length inte)HY(gral)YH( types
+ )} 0 0 1 0 3 1 1 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+0
+0
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(integer)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(integer)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(long\240long)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(nonPos)HY(i)HY(tiveIn)HY(te)HY(ger)YH()ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(non_posi)HY(tive)YH(_integer)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(long\240long)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(nonNeg)HY(a)HY(tiveIn)HY(te)HY(ger)YH()ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(non_nega)HY(tive)YH(_integer)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(unsigned long\240long)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(posi)HY(tiveIn)HY(te)HY(ger)YH()ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(posi)HY(tive)YH(_integer)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(unsigned long\240long)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(nega)HY(tiveIn)HY(te)HY(ger)YH()ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(nega)HY(tive)YH(_integer)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(long\240long)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB(boolean types
+ )} 0 0 1 0 3 1 1 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+0
+0
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(boolean)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(boolean)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(bool)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB(fixed-preci)HY(sion)YH( float)HY(ing)YH(-point types
+ )} 0 0 1 0 3 1 1 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+0
+0
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(float)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(float_)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(float)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(double)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(double_)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(double)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB(arbi)HY(trary)YH(-preci)HY(sion)YH( float)HY(ing)YH(-point types
+ )} 0 0 1 0 3 1 1 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+0
+0
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(decimal)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(decimal)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(double)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB(string types
+ )} 0 0 1 0 3 1 1 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+0
+0
+]]
+[0 0 0 0 0 0 [[{()1 Sl()WB()SM(string)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB()SM(string)ES()} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+[{()1 Sl()WB(type derived from )SM(std::basic_string)ES(
+ )} 0 0 0 0 1 1 0 (.) 2 0 4 4 2 6 0 0 0 0 Db 0 ]
+]]
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+ )UL( )-1 LI()R1 2 A(C++/Tree
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+
+ )UL( )-1 LI(Generic repre)HY(sen)HY(ta)HY(tion)YH( of XML in terms of elements, attributes,
+ and text forces an appli)HY(ca)HY(tion)YH( devel)HY(oper)YH( to write a substan)HY(tial)YH(
+ amount of bridg)HY(ing)YH( code that iden)HY(ti)HY(fies)YH( and trans)HY(forms)YH( pieces
+ of infor)HY(ma)HY(tion)YH( encoded in XML to a repre)HY(sen)HY(ta)HY(tion)YH( more suit)HY(able)YH(
+ for consump)HY(tion)YH( by the appli)HY(ca)HY(tion)YH( logic.
+
+ )-1 LI(String-based flow control defers error detec)HY(tion)YH( to runtime.
+ It also reduces code read)HY(abil)HY(ity)YH( and main)HY(tain)HY(abil)HY(ity)YH(.
+
+ )-1 LI(Lack of type safety because the data is repre)HY(sented)YH( as text.
+
+ )-1 LI(Result)HY(ing)YH( appli)HY(ca)HY(tions)YH( are hard to debug, change, and
+ main)HY(tain)YH(.
+ )LU(
+
+ )0 P(In contrast, stat)HY(i)HY(cally)YH(-typed, vocab)HY(u)HY(lary)YH(-specific object model
+ produced by the C++/Tree mapping allows you to operate in your
+ domain terms instead of the generic elements, attributes, and
+ text. Static typing helps catch errors at compile-time rather
+ than at run-time. Auto)HY(matic)YH( code gener)HY(a)HY(tion)YH( frees you for more
+ inter)HY(est)HY(ing)YH( tasks \201such as doing some)HY(thing)YH( useful with the
+ infor)HY(ma)HY(tion)YH( stored in the XML docu)HY(ments)YH(\202 and mini)HY(mizes)YH( the
+ effort needed to adapt your appli)HY(ca)HY(tions)YH( to changes in the
+ docu)HY(ment)YH( struc)HY(ture)YH(. To summa)HY(rize)YH(, the C++/Tree object model has
+ the follow)HY(ing)YH( key advan)HY(tages)YH( over generic XML access APIs:)EP(
+
+ )UL( )-1 LI()BD(Ease of use.)ES( The gener)HY(ated)YH( code hides all the complex)HY(ity)YH(
+ asso)HY(ci)HY(ated)YH( with parsing and seri)HY(al)HY(iz)HY(ing)YH( XML. This includes navi)HY(gat)HY(ing)YH(
+ the struc)HY(ture)YH( and convert)HY(ing)YH( between the text repre)HY(sen)HY(ta)HY(tion)YH( and
+ data types suit)HY(able)YH( for manip)HY(u)HY(la)HY(tion)YH( by the appli)HY(ca)HY(tion)YH(
+ logic.
+
+ )-1 LI()BD(Natural repre)HY(sen)HY(ta)HY(tion)YH(.)ES( The object repre)HY(sen)HY(ta)HY(tion)YH( allows
+ you to access the XML data using your domain vocab)HY(u)HY(lary)YH( instead
+ of generic elements, attributes, and text.
+
+ )-1 LI()BD(Concise code.)ES( With the object repre)HY(sen)HY(ta)HY(tion)YH( the
+ appli)HY(ca)HY(tion)YH( imple)HY(men)HY(ta)HY(tion)YH( is simpler and thus easier
+ to read and under)HY(stand)YH(.
+
+ )-1 LI()BD(Safety.)ES( The gener)HY(ated)YH( object model is stat)HY(i)HY(cally)YH(
+ typed and uses func)HY(tions)YH( instead of strings to access the
+ infor)HY(ma)HY(tion)YH(. This helps catch program)HY(ming)YH( errors at compile-time
+ rather than at runtime.
+
+ )-1 LI()BD(Main)HY(tain)HY(abil)HY(ity)YH(.)ES( Auto)HY(matic)YH( code gener)HY(a)HY(tion)YH( mini)HY(mizes)YH( the
+ effort needed to adapt the appli)HY(ca)HY(tion)YH( to changes in the
+ docu)HY(ment)YH( struc)HY(ture)YH(. With static typing, the C++ compiler
+ can pin-point the places in the client code that need to be
+ changed.
+
+ )-1 LI()BD(Compat)HY(i)HY(bil)HY(ity)YH(.)ES( Sequences of elements are repre)HY(sented)YH( in
+ the object model as contain)HY(ers)YH( conform)HY(ing)YH( to the stan)HY(dard)YH( C++
+ sequence require)HY(ments)YH(. This makes it possi)HY(ble)YH( to use stan)HY(dard)YH(
+ C++ algo)HY(rithms)YH( on the object repre)HY(sen)HY(ta)HY(tion)YH( and frees you from
+ learn)HY(ing)YH( yet another container inter)HY(face)YH(, as is the case with
+ DOM.
+
+ )-1 LI()BD(Effi)HY(ciency)YH(.)ES( If the appli)HY(ca)HY(tion)YH( makes repet)HY(i)HY(tive)YH( use
+ of the data extracted from XML, then the C++/Tree object model
+ is more effi)HY(cient)YH( because the navi)HY(ga)HY(tion)YH( is performed using
+ func)HY(tion)YH( calls rather than string compar)HY(isons)YH( and the XML
+ data is extracted only once. Further)HY(more)YH(, the runtime memory
+ usage is reduced due to more effi)HY(cient)YH( data storage
+ \201for instance, storing numeric data as inte)HY(gers)YH( instead of
+ strings\202 as well as the static knowl)HY(edge)YH( of cardi)HY(nal)HY(ity)YH(
+ constraints.
+ )LU(
+
+
+
+
+
+ )0 1 6 H(2)WB 41 Sn()WB 9 Sn( Hello World Example)EA()EH(
+
+ )0 P(In this chapter we will examine how to parse, access, modify, and
+ seri)HY(al)HY(ize)YH( a very simple XML docu)HY(ment)YH( using the XSD-gener)HY(ated)YH(
+ C++/Tree object model. The code presented in this chapter is
+ based on the )SM(hello)ES( example which can be found in
+ the )SM(exam)HY(ples)YH(/cxx/tree/)ES( direc)HY(tory)YH( of the XSD
+ distri)HY(bu)HY(tion)YH(.)EP(
+
+ )0 2 7 H(2.1)WB 42 Sn()WB 10 Sn( Writing XML Docu)HY(ment)YH( and Schema)EA()EH(
+
+ )0 P(First, we need to get an idea about the struc)HY(ture)YH(
+ of the XML docu)HY(ments)YH( we are going to process. Our
+ )SM(hello.xml)ES(, for example, could look like this:)EP(
+
+ ) 10 28 PR(<?xml version="1.0"?>
+<hello>
+
+ <greeting>Hello</greeting>
+
+ <name>sun</name>
+ <name>moon</name>
+ <name>world</name>
+
+</hello>)RP(
+
+ )0 P(Then we can write a descrip)HY(tion)YH( of the above XML in the
+ XML Schema language and save it into )SM(hello.xsd)ES(:)EP(
+
+ ) 13 70 PR(<?xml version="1.0"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+
+ <xs:complexType name="hello_t">
+ <xs:sequence>
+ <xs:element name="greeting" type="xs:string"/>
+ <xs:element name="name" type="xs:string" maxOccurs="unbounded"/>
+ </xs:sequence>
+ </xs:complexType>
+
+ <xs:element name="hello" type="hello_t"/>
+
+</xs:schema>)RP(
+
+ )0 P(Even if you are not famil)HY(iar)YH( with XML Schema, it
+ should be easy to connect decla)HY(ra)HY(tions)YH( in )SM(hello.xsd)ES(
+ to elements in )SM(hello.xml)ES(. The )SM(hello_t)ES( type
+ is defined as a sequence of the nested )SM(greet)HY(ing)YH()ES( and
+ )SM(name)ES( elements. Note that the term sequence in XML
+ Schema means that elements should appear in a partic)HY(u)HY(lar)YH( order
+ as opposed to appear)HY(ing)YH( multi)HY(ple)YH( times. The )SM(name)ES(
+ element has its )SM(maxOc)HY(curs)YH()ES( prop)HY(erty)YH( set to
+ )SM(unbounded)ES( which means it can appear multi)HY(ple)YH( times
+ in an XML docu)HY(ment)YH(. Finally, the glob)HY(ally)YH(-defined )SM(hello)ES(
+ element prescribes the root element for our vocab)HY(u)HY(lary)YH(. For an
+ easily-approach)HY(able)YH( intro)HY(duc)HY(tion)YH( to XML Schema refer to
+ )R8 2 A(XML Schema Part 0:
+ Primer)EA(.)EP(
+
+ )0 P(The above schema is a spec)HY(i)HY(fi)HY(ca)HY(tion)YH( of our XML vocab)HY(u)HY(lary)YH(; it tells
+ every)HY(body)YH( what valid docu)HY(ments)YH( of our XML-based language should look
+ like. We can also update our )SM(hello.xml)ES( to include the
+ infor)HY(ma)HY(tion)YH( about the schema so that XML parsers can vali)HY(date)YH(
+ our docu)HY(ment)YH(:)EP(
+
+ ) 11 60 PR(<?xml version="1.0"?>
+<hello xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:noNamespaceSchemaLocation="hello.xsd">
+
+ <greeting>Hello</greeting>
+
+ <name>sun</name>
+ <name>moon</name>
+ <name>world</name>
+
+</hello>)RP(
+
+
+ )0 P(The next step is to compile the schema to gener)HY(ate)YH( the object
+ model and parsing func)HY(tions)YH(.)EP(
+
+ )0 2 8 H(2.2)WB 43 Sn()WB 11 Sn( Trans)HY(lat)HY(ing)YH( Schema to C++)EA()EH(
+
+ )0 P(Now we are ready to trans)HY(late)YH( our )SM(hello.xsd)ES( to C++.
+ To do this we invoke the XSD compiler from a termi)HY(nal)YH( \201UNIX\202 or
+ a command prompt \201Windows\202:
+ )EP(
+
+ ) 1 24 PR($ xsd cxx-tree hello.xsd)RP(
+
+ )0 P(The XSD compiler produces two C++ files: )SM(hello.hxx)ES( and
+ )SM(hello.cxx)ES(. The follow)HY(ing)YH( code frag)HY(ment)YH( is taken from
+ )SM(hello.hxx)ES(; it should give you an idea about what gets
+ gener)HY(ated)YH(:
+ )EP(
+
+ ) 45 60 PR(class hello_t
+{
+public:
+ // greeting
+ //
+ typedef xml_schema::string greeting_type;
+
+ const greeting_type&
+ greeting \201\202 const;
+
+ greeting_type&
+ greeting \201\202;
+
+ void
+ greeting \201const greeting_type& x\202;
+
+ // name
+ //
+ typedef xml_schema::string name_type;
+ typedef xsd::sequence<name_type> name_sequence;
+ typedef name_sequence::iterator name_iterator;
+ typedef name_sequence::const_iterator name_const_iterator;
+
+ const name_sequence&
+ name \201\202 const;
+
+ name_sequence&
+ name \201\202;
+
+ void
+ name \201const name_sequence& s\202;)WR(
+
+ // Constructor.
+ //
+ hello_t \201const greeting_type&\202;
+
+ ...
+
+};
+
+std::auto_ptr<hello_t>
+hello \201const std::string& uri\202;
+
+std::auto_ptr<hello_t>
+hello \201std::istream&\202;)RP(
+
+ )0 P(The )SM(hello_t)ES( C++ class corre)HY(sponds)YH( to the
+ )SM(hello_t)ES( XML Schema type. For each element
+ in this type a set of C++ type defi)HY(ni)HY(tions)YH( as well as
+ acces)HY(sor)YH( and modi)HY(fier)YH( func)HY(tions)YH( are gener)HY(ated)YH( inside the
+ )SM(hello_t)ES( class. Note that the type defi)HY(ni)HY(tions)YH(
+ and member func)HY(tions)YH( for the )SM(greet)HY(ing)YH()ES( and
+ )SM(name)ES( elements are differ)HY(ent)YH( because of the
+ cardi)HY(nal)HY(ity)YH( differ)HY(ences)YH( between these two elements
+ \201)SM(greet)HY(ing)YH()ES( is a required single element and
+ )SM(name)ES( is a sequence of elements\202.)EP(
+
+ )0 P(The )SM(xml_schema::string)ES( type used in the type
+ defi)HY(ni)HY(tions)YH( is a C++ class provided by the XSD runtime
+ that corre)HY(sponds)YH( to built-in XML Schema type
+ )SM(string)ES(. The )SM(xml_schema::string)ES(
+ is based on )SM(std::string)ES( and can be used as
+ such. Simi)HY(larly)YH(, the )SM(sequence)ES( class template
+ that is used in the )SM(name_sequence)ES( type
+ defi)HY(ni)HY(tion)YH( is based on and has the same inter)HY(face)YH( as
+ )SM(std::vector)ES(. The mapping between the built-in
+ XML Schema types and C++ types is described in more detail in
+ )0 27 1 A(Section 4.5, "Mapping for the Built-in XML Schema
+ Types")27 0 TN TL()Ec /AF f D(. The )SM(hello_t)ES( class also includes a
+ construc)HY(tor)YH( with an initial)HY(izer)YH( for the required
+ )SM(greet)HY(ing)YH()ES( element as its argu)HY(ment)YH(.)EP(
+
+ )0 P(The )SM(hello)ES( over)HY(loaded)YH( global func)HY(tions)YH( corre)HY(spond)YH(
+ to the )SM(hello)ES( global element in XML Schema. A
+ global element in XML Schema is a valid docu)HY(ment)YH( root.
+ By default XSD gener)HY(ated)YH( a set of parsing func)HY(tions)YH( for each
+ global element defined in XML Schema \201this can be over)HY(rid)HY(den)YH(
+ with the )SM(--root-element-*)ES( options\202. For more
+ infor)HY(ma)HY(tion)YH( on parsing func)HY(tions)YH( see )0 29 1 A(Chapter 5,
+ "Parsing")29 0 TN TL()Ec /AF f D(.)EP(
+
+ )0 2 9 H(2.3)WB 44 Sn()WB 12 Sn( Imple)HY(ment)HY(ing)YH( Appli)HY(ca)HY(tion)YH( Logic)EA()EH(
+
+ )0 P(At this point we have all the parts we need to do some)HY(thing)YH( useful
+ with the infor)HY(ma)HY(tion)YH( stored in our XML docu)HY(ment)YH(:
+ )EP(
+
+ ) 25 62 PR(#include <iostream>
+#include "hello.hxx"
+
+using namespace std;
+
+int
+main \201int argc, char* argv[]\202
+{
+ try
+ {
+ auto_ptr<hello_t> h \201hello \201argv[1]\202\202;
+
+ for \201hello_t::name_const_iterator i \201h->name \201\202.begin \201\202\202;
+ i != h->name \201\202.end \201\202;
+ ++i\202
+ {
+ cerr << h->greeting \201\202 << ", " << *i << "!" << endl;
+ }
+ }
+ catch \201const xml_schema::exception& e\202
+ {
+ cerr << e << endl;
+ return 1;
+ }
+})RP(
+
+ )0 P(The first part of our appli)HY(ca)HY(tion)YH( calls one of the parsing
+ func)HY(tions)YH( to parser an XML file spec)HY(i)HY(fied)YH( in the command line.
+ We then use the returned object model to iterate over names
+ and print a greet)HY(ing)YH( line for each of them. Finally, we
+ catch and print the )SM(xml_schema::excep)HY(tion)YH()ES(
+ excep)HY(tion)YH( in case some)HY(thing)YH( goes wrong. This excep)HY(tion)YH(
+ is the root of the excep)HY(tion)YH( hier)HY(ar)HY(chy)YH( used by the
+ XSD-gener)HY(ated)YH( code.
+ )EP(
+
+
+ )0 2 10 H(2.4)WB 45 Sn()WB 13 Sn( Compil)HY(ing)YH( and Running)EA()EH(
+
+ )0 P(After saving our appli)HY(ca)HY(tion)YH( from the previ)HY(ous)YH( section in
+ )SM(driver.cxx)ES(, we are ready to compile our first
+ program and run it on the test XML docu)HY(ment)YH(. On a UNIX
+ system this can be done with the follow)HY(ing)YH( commands:
+ )EP(
+
+ ) 6 43 PR($ c++ -I.../libxsd -c driver.cxx hello.cxx
+$ c++ -o driver driver.o hello.o -lxerces-c
+$ ./driver hello.xml
+Hello, sun!
+Hello, moon!
+Hello, world!)RP(
+
+ )0 P(Here )SM(.../libxsd)ES( repre)HY(sents)YH( the path to the
+ )SM(libxsd)ES( direc)HY(tory)YH( in the XSD distri)HY(bu)HY(tion)YH(.
+ Note also that we are required to link our appli)HY(ca)HY(tion)YH(
+ with the Xerces-C++ library because the gener)HY(ated)YH( code
+ uses it as the under)HY(ly)HY(ing)YH( XML parser.)EP(
+
+ )0 2 11 H(2.5)WB 46 Sn()WB 14 Sn( Adding Seri)HY(al)HY(iza)HY(tion)YH()EA()EH(
+
+ )0 P(While parsing and access)HY(ing)YH( the XML data may be every)HY(thing)YH(
+ you need, there are appli)HY(ca)HY(tions)YH( that require creat)HY(ing)YH( new
+ or modi)HY(fy)HY(ing)YH( exist)HY(ing)YH( XML docu)HY(ments)YH(. By default XSD does
+ not produce seri)HY(al)HY(iza)HY(tion)YH( code. We will need to request
+ it with the )SM(--gener)HY(ate)YH(-seri)HY(al)HY(iza)HY(tion)YH()ES( options:)EP(
+
+ ) 1 49 PR($ xsd cxx-tree --generate-serialization hello.xsd)RP(
+
+ )0 P(If we now examine the gener)HY(ated)YH( )SM(hello.hxx)ES( file,
+ we will find a set of over)HY(loaded)YH( seri)HY(al)HY(iza)HY(tion)YH( func)HY(tions)YH(,
+ includ)HY(ing)YH( the follow)HY(ing)YH( version:)EP(
+
+ ) 5 45 PR(void
+hello \201std::ostream&,
+ const hello_t&,
+ const xml_schema::namespace_infomap& =
+ xml_schema::namespace_infomap \201\202\202;
+)RP(
+
+ )0 P(Just like with parsing func)HY(tions)YH(, XSD gener)HY(ates)YH( seri)HY(al)HY(iza)HY(tion)YH(
+ func)HY(tions)YH( for each global element unless instructed other)HY(wise)YH(
+ with one of the )SM(--root-element-*)ES( options. For more
+ infor)HY(ma)HY(tion)YH( on seri)HY(al)HY(iza)HY(tion)YH( func)HY(tions)YH( see )0 32 1 A(Chapter 6,
+ "Seri)HY(al)HY(iza)HY(tion)YH(")32 0 TN TL()Ec /AF f D(.)EP(
+
+ )0 P(We first examine an appli)HY(ca)HY(tion)YH( that modi)HY(fies)YH( an exist)HY(ing)YH(
+ object model and seri)HY(al)HY(izes)YH( it back to XML:)EP(
+
+ ) 34 50 PR(#include <iostream>
+#include "hello.hxx"
+
+using namespace std;
+
+int
+main \201int argc, char* argv[]\202
+{
+ try
+ {
+ auto_ptr<hello_t> h \201hello \201argv[1]\202\202;
+
+ // Change the greeting phrase.
+ //
+ h->greeting \201"Hi"\202;
+
+ // Add another entry to the name sequence.
+ //
+ h->name \201\202.push_back \201"mars"\202;
+
+ // Serialize the modified object model to XML.
+ //
+ xml_schema::namespace_infomap map;
+ map[""].name = "";
+ map[""].schema = "hello.xsd";
+
+ hello \201cout, *h, map\202;
+ }
+ catch \201const xml_schema::exception& e\202
+ {
+ cerr << e << endl;)WR(
+ return 1;
+ }
+})RP(
+
+ )0 P(First, our appli)HY(ca)HY(tion)YH( parses an XML docu)HY(ment)YH( and obtains its
+ object model as in the previ)HY(ous)YH( example. Then it changes the
+ greet)HY(ing)YH( string and adds another entry to the list of names.
+ Finally, it seri)HY(al)HY(izes)YH( the object model back to XML by calling
+ the seri)HY(al)HY(iza)HY(tion)YH( func)HY(tion)YH(.)EP(
+
+ )0 P(The first argu)HY(ment)YH( we pass to the seri)HY(al)HY(iza)HY(tion)YH( func)HY(tion)YH( is
+ )SM(cout)ES( which results in the XML being written to
+ the stan)HY(dard)YH( output for us to inspect. We could have also
+ written the result to a file or memory buffer by creat)HY(ing)YH( an
+ instance of )SM(std::ofstream)ES( or )SM(std::ostringstream)ES(
+ and passing it instead of )SM(cout)ES(. The second argu)HY(ment)YH( is the
+ object model we want to seri)HY(al)HY(ize)YH(. The final argu)HY(ment)YH( is an optional
+ names)HY(pace)YH( infor)HY(ma)HY(tion)YH( map for our vocab)HY(u)HY(lary)YH(. It captures infor)HY(ma)HY(tion)YH(
+ such as names)HY(paces)YH(, names)HY(pace)YH( prefixes to which they should be mapped,
+ and schemas asso)HY(ci)HY(ated)YH( with these names)HY(paces)YH(. If we don't provide
+ this argu)HY(ment)YH( then generic names)HY(pace)YH( prefixes \201)SM(p1)ES(,
+ )SM(p2)ES(, etc.\202 will be auto)HY(mat)HY(i)HY(cally)YH( assigned to XML names)HY(paces)YH(
+ and no schema infor)HY(ma)HY(tion)YH( will be added to the result)HY(ing)YH( docu)HY(ment)YH(
+ \201see )0 32 1 A(Chapter 6, "Seri)HY(al)HY(iza)HY(tion)YH(")32 0 TN TL()Ec /AF f D( for details\202.
+ In our case, the prefix \201map key\202 and names)HY(pace)YH( name are empty
+ because our vocab)HY(u)HY(lary)YH( does not use XML names)HY(paces)YH(.)EP(
+
+ )0 P(If we now compile and run this appli)HY(ca)HY(tion)YH( we will see the
+ output as shown in the follow)HY(ing)YH( listing:)EP(
+
+ ) 12 60 PR(<?xml version="1.0"?>
+<hello xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:noNamespaceSchemaLocation="hello.xsd">
+
+ <greeting>Hi</greeting>
+
+ <name>sun</name>
+ <name>moon</name>
+ <name>world</name>
+ <name>mars</name>
+
+</hello>)RP(
+
+ )0 P(We can also create and seri)HY(al)HY(ize)YH( an object model from scratch
+ as shown in the follow)HY(ing)YH( example:)EP(
+
+ ) 33 43 PR(#include <iostream>
+#include <fstream>
+#include "hello.hxx"
+
+using namespace std;
+
+int
+main \201int argc, char* argv[]\202
+{
+ try
+ {
+ hello_t h \201"Hi"\202;
+
+ hello_t::name_sequence& ns \201h.name \201\202\202;
+
+ ns.push_back \201"Jane"\202;
+ ns.push_back \201"John"\202;
+
+ // Serialize the object model to XML.
+ //
+ xml_schema::namespace_infomap map;
+ map[""].name = "";
+ map[""].schema = "hello.xsd";
+
+ std::ofstream ofs \201argv[1]\202;
+ hello \201ofs, h, map\202;
+ }
+ catch \201const xml_schema::exception& e\202
+ {
+ cerr << e << endl;
+ return 1;)WR(
+ }
+})RP(
+
+ )0 P(In this example we used the gener)HY(ated)YH( construc)HY(tor)YH( to create
+ an instance of type )SM(hello_t)ES(. To reduce typing,
+ we obtained a refer)HY(ence)YH( to the name sequence which we then
+ used to add a few names. The seri)HY(al)HY(iza)HY(tion)YH( part is iden)HY(ti)HY(cal)YH(
+ to the previ)HY(ous)YH( example except this time we are writing to
+ a file. If we compile and run this program, it produces the
+ follow)HY(ing)YH( XML file:)EP(
+
+ ) 10 60 PR(<?xml version="1.0"?>
+<hello xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:noNamespaceSchemaLocation="hello.xsd">
+
+ <greeting>Hi</greeting>
+
+ <name>Jane</name>
+ <name>John</name>
+
+</hello>)RP(
+
+ )0 2 12 H(2.6)WB 47 Sn()WB 15 Sn( Select)HY(ing)YH( Naming Conven)HY(tion)YH()EA()EH(
+
+ )0 P(By default XSD uses the so-called K&R \201Kernighan and Ritchie\202
+ iden)HY(ti)HY(fier)YH( naming conven)HY(tion)YH( in the gener)HY(ated)YH( code. In this
+ conven)HY(tion)YH( both type and func)HY(tion)YH( names are in lower case and
+ words are sepa)HY(rated)YH( by under)HY(scores)YH(. If your appli)HY(ca)HY(tion)YH( code or
+ schemas use a differ)HY(ent)YH( nota)HY(tion)YH(, you may want to change the
+ naming conven)HY(tion)YH( used in the gener)HY(ated)YH( code for consis)HY(tency)YH(.
+ XSD supports a set of widely-used naming conven)HY(tions)YH(
+ that you can select with the )SM(--type-naming)ES( and
+ )SM(--func)HY(tion)YH(-naming)ES( options. You can also further
+ refine one of the prede)HY(fined)YH( conven)HY(tions)YH( or create a completely
+ custom naming scheme by using the )SM(--*-regex)ES( options.)EP(
+
+ )0 P(As an example, let's assume that our "Hello World" appli)HY(ca)HY(tion)YH(
+ uses the so-called upper-camel-case naming conven)HY(tion)YH( for types
+ \201that is, each word in a type name is capi)HY(tal)HY(ized)YH(\202 and the K&R
+ conven)HY(tion)YH( for func)HY(tion)YH( names. Since K&R is the default
+ conven)HY(tion)YH( for both type and func)HY(tion)YH( names, we only need to
+ change the type naming scheme:)EP(
+
+ ) 1 42 PR($ xsd cxx-tree --type-naming ucc hello.xsd)RP(
+
+ )0 P(The )SM(ucc)ES( argu)HY(ment)YH( to the )SM(--type-naming)ES(
+ options stands for upper-camel-case. If we now examine the
+ gener)HY(ated)YH( )SM(hello.hxx)ES(, we will see the follow)HY(ing)YH(
+ changes compared to the decla)HY(ra)HY(tions)YH( shown in the previ)HY(ous)YH(
+ sections:)EP(
+
+ ) 45 57 PR(class Hello_t
+{
+public:
+ // greeting
+ //
+ typedef xml_schema::String GreetingType;
+
+ const GreetingType&
+ greeting \201\202 const;
+
+ GreetingType&
+ greeting \201\202;
+
+ void
+ greeting \201const GreetingType& x\202;
+
+ // name
+ //
+ typedef xml_schema::String NameType;
+ typedef xsd::sequence<NameType> NameSequence;
+ typedef NameSequence::iterator NameIterator;
+ typedef NameSequence::const_iterator NameConstIterator;
+
+ const NameSequence&
+ name \201\202 const;
+
+ NameSequence&
+ name \201\202;
+
+ void
+ name \201const NameSequence& s\202;)WR(
+
+ // Constructor.
+ //
+ Hello_t \201const GreetingType&\202;
+
+ ...
+
+};
+
+std::auto_ptr<Hello_t>
+hello \201const std::string& uri\202;
+
+std::auto_ptr<Hello_t>
+hello \201std::istream&\202;)RP(
+
+ )0 P(Notice that the type names in the )SM(xml_schema)ES( names)HY(pace)YH(,
+ for example )SM(xml_schema::String)ES(, now also use the
+ upper-camel-case naming conven)HY(tion)YH(. The only thing that we may
+ be unhappy about in the above code is the )SM(_t)ES(
+ suffix in )SM(Hello_t)ES(. If we are not in a posi)HY(tion)YH(
+ to change the schema, we can )EM(touch-up)ES( the )SM(ucc)ES(
+ conven)HY(tion)YH( with a custom trans)HY(la)HY(tion)YH( rule using the
+ )SM(--type-regex)ES( option:)EP(
+
+ ) 1 72 PR($ xsd cxx-tree --type-naming ucc --type-regex '/ \201.+\202_t/\200u$1/' hello.xsd)RP(
+
+ )0 P(This results in the follow)HY(ing)YH( changes to the gener)HY(ated)YH( code:)EP(
+
+ ) 45 57 PR(class Hello
+{
+public:
+ // greeting
+ //
+ typedef xml_schema::String GreetingType;
+
+ const GreetingType&
+ greeting \201\202 const;
+
+ GreetingType&
+ greeting \201\202;
+
+ void
+ greeting \201const GreetingType& x\202;
+
+ // name
+ //
+ typedef xml_schema::String NameType;
+ typedef xsd::sequence<NameType> NameSequence;
+ typedef NameSequence::iterator NameIterator;
+ typedef NameSequence::const_iterator NameConstIterator;
+
+ const NameSequence&
+ name \201\202 const;
+
+ NameSequence&
+ name \201\202;
+
+ void
+ name \201const NameSequence& s\202;)WR(
+
+ // Constructor.
+ //
+ Hello \201const GreetingType&\202;
+
+ ...
+
+};
+
+std::auto_ptr<Hello>
+hello \201const std::string& uri\202;
+
+std::auto_ptr<Hello>
+hello \201std::istream&\202;)RP(
+
+ )0 P(For more detailed infor)HY(ma)HY(tion)YH( on the )SM(--type-naming)ES(,
+ )SM(--func)HY(tion)YH(-naming)ES(, )SM(--type-regex)ES(, and
+ other )SM(--*-regex)ES( options refer to the NAMING
+ CONVEN)HY(TION)YH( section in the )R5 2 A(XSD
+ Compiler Command Line Manual)EA(.)EP(
+
+ )0 2 13 H(2.7)WB 48 Sn()WB 16 Sn( Gener)HY(at)HY(ing)YH( Docu)HY(men)HY(ta)HY(tion)YH()EA()EH(
+
+ )0 P(While our object model is quite simple, real-world vocab)HY(u)HY(lar)HY(ies)YH(
+ can be quite complex with hundreds of types, elements, and
+ attributes. For such vocab)HY(u)HY(lar)HY(ies)YH( figur)HY(ing)YH( out which types
+ provide which member func)HY(tions)YH( by study)HY(ing)YH( the gener)HY(ated)YH(
+ source code or schemas can be a daunt)HY(ing)YH( task. To provide
+ appli)HY(ca)HY(tion)YH( devel)HY(op)HY(ers)YH( with a more acces)HY(si)HY(ble)YH( way of
+ under)HY(stand)HY(ing)YH( the gener)HY(ated)YH( object models, the XSD compiler
+ can be instructed to produce source code with docu)HY(men)HY(ta)HY(tion)YH(
+ comments in the Doxygen format. Then the source code can be
+ processed with the )R9 2 A(Doxygen)EA(
+ docu)HY(men)HY(ta)HY(tion)YH( system to extract this infor)HY(ma)HY(tion)YH( and produce
+ docu)HY(men)HY(ta)HY(tion)YH( in various formats.
+ )EP(
+
+ )0 P(In this section we will see how to gener)HY(ate)YH( docu)HY(men)HY(ta)HY(tion)YH(
+ for our "Hello World" vocab)HY(u)HY(lary)YH(. To show)HY(case)YH( the full power
+ of the XSD docu)HY(men)HY(ta)HY(tion)YH( facil)HY(i)HY(ties)YH(, we will first docu)HY(ment)YH(
+ our schema. The XSD compiler will then trans)HY(fer)YH(
+ this infor)HY(ma)HY(tion)YH( from the schema to the gener)HY(ated)YH( code and
+ then to the object model docu)HY(men)HY(ta)HY(tion)YH(. Note that the
+ docu)HY(men)HY(ta)HY(tion)YH( in the schema is not required for XSD to
+ gener)HY(ate)YH( useful docu)HY(men)HY(ta)HY(tion)YH(. Below you will find
+ our )SM(hello.xsd)ES( with added docu)HY(men)HY(ta)HY(tion)YH(:)EP(
+
+ ) 43 69 PR(<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+
+ <xs:complexType name="hello_t">
+
+ <xs:annotation>
+ <xs:documentation>
+ The hello_t type consists of a greeting phrase and a
+ collection of names to which this greeting applies.
+ </xs:documentation>
+ </xs:annotation>
+
+ <xs:sequence>
+
+ <xs:element name="greeting" type="xs:string">
+ <xs:annotation>
+ <xs:documentation>
+ The greeting element contains the greeting phrase
+ for this hello object.
+ </xs:documentation>
+ </xs:annotation>
+ </xs:element>
+
+ <xs:element name="name" type="xs:string" maxOccurs="unbounded">
+ <xs:annotation>
+ <xs:documentation>
+ The name elements contains names to be greeted.
+ </xs:documentation>
+ </xs:annotation>
+ </xs:element>
+
+ </xs:sequence>)WR(
+ </xs:complexType>
+
+ <xs:element name="hello" type="hello_t">
+ <xs:annotation>
+ <xs:documentation>
+ The hello element is a root of the Hello XML vocabulary.
+ Every conforming document should start with this element.
+ </xs:documentation>
+ </xs:annotation>
+ </xs:element>
+
+</xs:schema>)RP(
+
+ )0 P(The first step in obtain)HY(ing)YH( the docu)HY(men)HY(ta)HY(tion)YH( is to recom)HY(pile)YH(
+ our schema with the )SM(--gener)HY(ate)YH(-doxygen)ES( option:)EP(
+
+ ) 1 68 PR($ xsd cxx-tree --generate-serialization --generate-doxygen hello.xsd)RP(
+
+ )0 P(Now the gener)HY(ated)YH( )SM(hello.hxx)ES( file contains comments
+ in the Doxygen format. The next step is to process this file
+ with the Doxygen docu)HY(men)HY(ta)HY(tion)YH( system. If your project does
+ not use Doxygen then you first need to create a config)HY(u)HY(ra)HY(tion)YH(
+ file for your project:)EP(
+
+ ) 1 26 PR($ doxygen -g hello.doxygen)RP(
+
+ )0 P(You only need to perform this step once. Now we can gener)HY(ate)YH(
+ the docu)HY(men)HY(ta)HY(tion)YH( by execut)HY(ing)YH( the follow)HY(ing)YH( command in the
+ direc)HY(tory)YH( with the gener)HY(ated)YH( source code:)EP(
+
+ ) 1 23 PR($ doxygen hello.doxygen)RP(
+
+ )0 P(While the gener)HY(ated)YH( docu)HY(men)HY(ta)HY(tion)YH( can be useful as is, we can
+ go one step further and link \201using the Doxygen tags mech)HY(a)HY(nism)YH(\202
+ the docu)HY(men)HY(ta)HY(tion)YH( for our object model with the docu)HY(men)HY(ta)HY(tion)YH(
+ for the XSD runtime library which defines C++ classes for the
+ built-in XML Schema types. This way we can seam)HY(lessly)YH( browse
+ between docu)HY(men)HY(ta)HY(tion)YH( for the )SM(hello_t)ES( class which
+ is gener)HY(ated)YH( by the XSD compiler and the )SM(xml_schema::string)ES(
+ class which is defined in the XSD runtime library. The Doxygen
+ config)HY(u)HY(ra)HY(tion)YH( file for the XSD runtime is provided with the XSD
+ distri)HY(bu)HY(tion)YH(.)EP(
+
+ )0 P(You can view the result of the steps described in this section
+ on the )R10 2 A(Hello
+ Example Docu)HY(men)HY(ta)HY(tion)YH()EA( page.)EP(
+
+
+
+
+ )0 1 14 H(3)WB 49 Sn()WB 17 Sn( Overall Mapping Config)HY(u)HY(ra)HY(tion)YH()EA()EH(
+
+ )0 P(The C++/Tree mapping has a number of config)HY(u)HY(ra)HY(tion)YH( param)HY(e)HY(ters)YH( that
+ deter)HY(mine)YH( the overall prop)HY(er)HY(ties)YH( and behav)HY(ior)YH( of the gener)HY(ated)YH( code.
+ Config)HY(u)HY(ra)HY(tion)YH( param)HY(e)HY(ters)YH( are spec)HY(i)HY(fied)YH( with the XSD command line
+ options. This chapter describes config)HY(u)HY(ra)HY(tion)YH( aspects that are most
+ commonly encoun)HY(tered)YH( by appli)HY(ca)HY(tion)YH( devel)HY(op)HY(ers)YH(. These include:
+ the char)HY(ac)HY(ter)YH( type that is used by the gener)HY(ated)YH( code, handling of
+ vocab)HY(u)HY(lar)HY(ies)YH( that use XML Schema poly)HY(mor)HY(phism)YH(, XML Schema to C++
+ names)HY(pace)YH( mapping, and thread safety. For more ways to config)HY(ure)YH(
+ the gener)HY(ated)YH( code refer to the
+ )R5 2 A(XSD
+ Compiler Command Line Manual)EA(.
+ )EP(
+
+ )0 2 15 H(3.1)WB 50 Sn()WB 18 Sn( Char)HY(ac)HY(ter)YH( Type and Encod)HY(ing)YH()EA()EH(
+
+ )0 P(The C++/Tree mapping has built-in support for two char)HY(ac)HY(ter)YH( types:
+ )SM(char)ES( and )SM(wchar_t)ES(. You can select the
+ char)HY(ac)HY(ter)YH( type with the )SM(--char-type)ES( command line
+ option. The default char)HY(ac)HY(ter)YH( type is )SM(char)ES(. The
+ char)HY(ac)HY(ter)YH( type affects all string and string-based types that
+ are used in the mapping. These include the string-based built-in
+ XML Schema types, excep)HY(tion)YH( types, stream types, etc.)EP(
+
+ )0 P(Another aspect of the mapping that depends on the char)HY(ac)HY(ter)YH( type
+ is char)HY(ac)HY(ter)YH( encod)HY(ing)YH(. For the )SM(char)ES( char)HY(ac)HY(ter)YH( type
+ the default encod)HY(ing)YH( is UTF-8. Other supported encod)HY(ings)YH( are
+ ISO-8859-1, Xerces-C++ Local Code Page \201LPC\202, as well as
+ custom encod)HY(ings)YH(. You can select which encod)HY(ing)YH( should be used
+ in the object model with the )SM(--char-encod)HY(ing)YH()ES( command
+ line option.)EP(
+
+ )0 P(For the )SM(wchar_t)ES( char)HY(ac)HY(ter)YH( type the encod)HY(ing)YH( is
+ auto)HY(mat)HY(i)HY(cally)YH( selected between UTF-16 and UTF-32/UCS-4 depend)HY(ing)YH(
+ on the size of the )SM(wchar_t)ES( type. On some plat)HY(forms)YH(
+ \201for example, Windows with Visual C++ and AIX with IBM XL C++\202
+ )SM(wchar_t)ES( is 2 bytes long. For these plat)HY(forms)YH( the
+ encod)HY(ing)YH( is UTF-16. On other plat)HY(forms)YH( )SM(wchar_t)ES( is 4 bytes
+ long and UTF-32/UCS-4 is used.)EP(
+
+ )0 P(Note also that the char)HY(ac)HY(ter)YH( encod)HY(ing)YH( that is used in the object model
+ is inde)HY(pen)HY(dent)YH( of the encod)HY(ings)YH( used in input and output XML. In fact,
+ all three \201object mode, input XML, and output XML\202 can have differ)HY(ent)YH(
+ encod)HY(ings)YH(.)EP(
+
+ )0 2 16 H(3.2)WB 51 Sn()WB 19 Sn( Support for Poly)HY(mor)HY(phism)YH()EA()EH(
+
+ )0 P(By default XSD gener)HY(ates)YH( non-poly)HY(mor)HY(phic)YH( code. If your vocab)HY(u)HY(lary)YH(
+ uses XML Schema poly)HY(mor)HY(phism)YH( in the form of )SM(xsi:type)ES(
+ and/or substi)HY(tu)HY(tion)YH( groups, then you will need to compile
+ your schemas with the )SM(--gener)HY(ate)YH(-poly)HY(mor)HY(phic)YH()ES( option
+ to produce poly)HY(mor)HY(phism)YH(-aware code. For more infor)HY(ma)HY(tion)YH( on
+ working with poly)HY(mor)HY(phic)YH( object models, refer to
+ )R11 2 A(Section 2.11,
+ "Mapping for )SM(xsi:type)ES( and Substi)HY(tu)HY(tion)YH( Groups")EA( in
+ the C++/Tree Mapping User Manual.)EP(
+
+ )0 2 17 H(3.3)WB 52 Sn()WB 20 Sn( Names)HY(pace)YH( Mapping)EA()EH(
+
+ )0 P(XSD maps XML names)HY(paces)YH( spec)HY(i)HY(fied)YH( in the )SM(target)HY(Names)HY(pace)YH()ES(
+ attribute in XML Schema to one or more nested C++ names)HY(paces)YH(. By
+ default, a names)HY(pace)YH( URI is mapped to a sequence of C++ names)HY(pace)YH(
+ names by remov)HY(ing)YH( the proto)HY(col)YH( and host parts and split)HY(ting)YH( the
+ rest into a sequence of names with )SM('/')ES( as the name
+ sepa)HY(ra)HY(tor)YH(.)EP(
+
+ )0 P(The default mapping of names)HY(pace)YH( URIs to C++ names)HY(paces)YH(
+ can be altered using the )SM(--names)HY(pace)YH(-map)ES( and
+ )SM(--names)HY(pace)YH(-regex)ES( compiler options. For example,
+ to map names)HY(pace)YH( URI )SM(http://www.codesyn)HY(the)HY(sis)YH(.com/my)ES( to
+ C++ names)HY(pace)YH( )SM(cs::my)ES(, we can use the follow)HY(ing)YH( option:)EP(
+
+ ) 1 54 PR(--namespace-map http://www.codesynthesis.com/my=cs::my)RP(
+
+ )0 P(A vocab)HY(u)HY(lary)YH( without a names)HY(pace)YH( is mapped to the global scope. This
+ also can be altered with the above options by using an empty name
+ for the XML names)HY(pace)YH(:)EP(
+
+ ) 1 19 PR(--namespace-map =cs)RP(
+
+ )0 2 18 H(3.4)WB 53 Sn()WB 21 Sn( Thread Safety)EA()EH(
+
+ )0 P(XSD-gener)HY(ated)YH( code is thread-safe in the sense that you can
+ use differ)HY(ent)YH( instan)HY(ti)HY(a)HY(tions)YH( of the object model in several
+ threads concur)HY(rently)YH(. This is possi)HY(ble)YH( due to the gener)HY(ated)YH(
+ code not relying on any writable global vari)HY(ables)YH(. If you need
+ to share the same object between several threads then you will
+ need to provide some form of synchro)HY(niza)HY(tion)YH(. One approach would
+ be to use the gener)HY(ated)YH( code customiza)HY(tion)YH( mech)HY(a)HY(nisms)YH( to embed
+ synchro)HY(niza)HY(tion)YH( prim)HY(i)HY(tives)YH( into the gener)HY(ated)YH( C++ classes. For more
+ infor)HY(ma)HY(tion)YH( on gener)HY(ated)YH( code customiza)HY(tion)YH( refer to the
+ )R2 2 A(C++/Tree
+ Mapping Customiza)HY(tion)YH( Guide)EA(.)EP(
+
+ )0 P(If you also would like to call parsing and/or seri)HY(al)HY(iza)HY(tion)YH(
+ func)HY(tions)YH( from several threads poten)HY(tially)YH( concur)HY(rently)YH(, then
+ you will need to make sure the Xerces-C++ runtime is initial)HY(ized)YH(
+ and termi)HY(nated)YH( only once. The easiest way to do this is to
+ initial)HY(ize)YH(/termi)HY(nate)YH( Xerces-C++ from )SM(main\201\202)ES( when
+ there are no threads yet/anymore:)EP(
+
+ ) 13 56 PR(#include <xercesc/util/PlatformUtils.hpp>
+
+int
+main \201\202
+{
+ xercesc::XMLPlatformUtils::Initialize \201\202;
+
+ {
+ // Start/terminate threads and parse/serialize here.
+ }
+
+ xercesc::XMLPlatformUtils::Terminate \201\202;
+})RP(
+
+ )0 P(Because you initial)HY(ize)YH( the Xerces-C++ runtime your)HY(self)YH( you should
+ also pass the )SM(xml_schema::flags::dont_initial)HY(ize)YH()ES( flag
+ to parsing and seri)HY(al)HY(iza)HY(tion)YH( func)HY(tions)YH(. See )0 29 1 A(Chapter 5,
+ "Parsing")29 0 TN TL()Ec /AF f D( and )0 32 1 A(Chapter 6, "Seri)HY(al)HY(iza)HY(tion)YH(")32 0 TN TL()Ec /AF f D( for
+ more infor)HY(ma)HY(tion)YH(.)EP(
+
+
+
+
+
+ )0 1 19 H(4)WB 54 Sn()WB 22 Sn( Working with Object Models)EA()EH(
+
+ )0 P(As we have seen in the previ)HY(ous)YH( chap)HY(ters)YH(, the XSD compiler gener)HY(ates)YH(
+ a C++ class for each type defined in XML Schema. Together these classes
+ consti)HY(tute)YH( an object model for an XML vocab)HY(u)HY(lary)YH(. In this chapter we
+ will take a closer look at differ)HY(ent)YH( elements that comprise an
+ object model class as well as how to create, access, and modify
+ object models.)EP(
+
+ )0 P(In this and subse)HY(quent)YH( chap)HY(ters)YH( we will use the follow)HY(ing)YH( schema
+ that describes a collec)HY(tion)YH( of person records. We save it in
+ )SM(people.xsd)ES(:)EP(
+
+ ) 30 71 PR(<?xml version="1.0"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+
+ <xs:simpleType name="gender_t">
+ <xs:restriction base="xs:string">
+ <xs:enumeration value="male"/>
+ <xs:enumeration value="female"/>
+ </xs:restriction>
+ </xs:simpleType>
+
+ <xs:complexType name="person_t">
+ <xs:sequence>
+ <xs:element name="first-name" type="xs:string"/>
+ <xs:element name="middle-name" type="xs:string" minOccurs="0"/>
+ <xs:element name="last-name" type="xs:string"/>
+ <xs:element name="gender" type="gender_t"/>
+ <xs:element name="age" type="xs:short"/>
+ </xs:sequence>
+ <xs:attribute name="id" type="xs:unsignedInt" use="required"/>
+ </xs:complexType>
+
+ <xs:complexType name="people_t">
+ <xs:sequence>
+ <xs:element name="person" type="person_t" maxOccurs="unbounded"/>
+ </xs:sequence>
+ </xs:complexType>
+
+ <xs:element name="people" type="people_t"/>
+
+</xs:schema>)RP(
+
+ )0 P(A sample XML instance to go along with this schema is saved
+ in )SM(people.xml)ES(:)EP(
+
+ ) 20 61 PR(<?xml version="1.0"?>
+<people xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:noNamespaceSchemaLocation="people.xsd">
+
+ <person id="1">
+ <first-name>John</first-name>
+ <last-name>Doe</last-name>
+ <gender>male</gender>
+ <age>32</age>
+ </person>
+
+ <person id="2">
+ <first-name>Jane</first-name>
+ <middle-name>Mary</middle-name>
+ <last-name>Doe</last-name>
+ <gender>female</gender>
+ <age>28</age>
+ </person>
+
+</people>)RP(
+
+ )0 P(Compil)HY(ing)YH( )SM(people.xsd)ES( with the XSD compiler results
+ in three gener)HY(ated)YH( C++ classes: )SM(gender_t)ES(,
+ )SM(person_t)ES(, and )SM(people_t)ES(.
+ The )SM(gender_t)ES( class is modelled after the C++
+ )SM(enum)ES( type. Its defi)HY(ni)HY(tion)YH( is presented below:)EP(
+
+ ) 17 41 PR(class gender_t: public xml_schema::string
+{
+public:
+ enum value
+ {
+ male,
+ female
+ };
+
+ gender_t \201value\202;
+ gender_t \201const xml_schema::string&\202;
+
+ gender_t&
+ operator= \201value\202;
+
+ operator value \201\202 const;
+};)RP(
+
+ )0 P(The follow)HY(ing)YH( listing shows how we can use this type:)EP(
+
+ ) 19 41 PR(gender_t m \201gender_t::male\202;
+gender_t f \201"female"\202;
+
+if \201m == "female" || f == gender_t::male\202
+{
+ ...
+}
+
+switch \201m\202
+{
+case gender_t::male:
+ {
+ ...
+ }
+case gender_t::female:
+ {
+ ...
+ }
+})RP(
+
+ )0 P(The other two classes will be exam)HY(ined)YH( in detail in the subse)HY(quent)YH(
+ sections.)EP(
+
+ )0 2 20 H(4.1)WB 55 Sn()WB 23 Sn( Attribute and Element Cardi)HY(nal)HY(i)HY(ties)YH()EA()EH(
+
+ )0 P(As we have seen in the previ)HY(ous)YH( chap)HY(ters)YH(, XSD gener)HY(ates)YH( a differ)HY(ent)YH(
+ set of type defi)HY(ni)HY(tions)YH( and member func)HY(tions)YH( for elements with
+ differ)HY(ent)YH( cardi)HY(nal)HY(i)HY(ties)YH(. The C++/Tree mapping divides all the possi)HY(ble)YH(
+ element and attribute cardi)HY(nal)HY(i)HY(ties)YH( into three cardi)HY(nal)HY(ity)YH( classes:
+ )EM(one)ES(, )EM(optional)ES(, and )EM(sequence)ES(.)EP(
+
+ )0 P(The )EM(one)ES( cardi)HY(nal)HY(ity)YH( class covers all elements that should
+ occur exactly once as well as required attributes. In our
+ example, the )SM(first-name)ES(, )SM(last-name)ES(,
+ )SM(gender)ES(, and )SM(age)ES( elements as well as
+ the )SM(id)ES( attribute belong to this cardi)HY(nal)HY(ity)YH( class.
+ The follow)HY(ing)YH( code frag)HY(ment)YH( shows type defi)HY(ni)HY(tions)YH( as well as the
+ acces)HY(sor)YH( and modi)HY(fier)YH( func)HY(tions)YH( that are gener)HY(ated)YH( for the
+ )SM(gender)ES( element in the )SM(person_t)ES( class:)EP(
+
+ ) 15 31 PR(class person_t
+{
+ // gender
+ //
+ typedef gender_t gender_type;
+
+ const gender_type&
+ gender \201\202 const;
+
+ gender_type&
+ gender \201\202;
+
+ void
+ gender \201const gender_type&\202;
+};)RP(
+
+ )0 P(The )SM(gender_type)ES( type is an alias for the element's type.
+ The first two acces)HY(sor)YH( func)HY(tions)YH( return read-only \201constant\202 and
+ read-write refer)HY(ences)YH( to the element's value, respec)HY(tively)YH(. The
+ modi)HY(fier)YH( func)HY(tion)YH( sets the new value for the element.)EP(
+
+ )0 P(The )EM(optional)ES( cardi)HY(nal)HY(ity)YH( class covers all elements that
+ can occur zero or one time as well as optional attributes. In our
+ example, the )SM(middle-name)ES( element belongs to this
+ cardi)HY(nal)HY(ity)YH( class. The follow)HY(ing)YH( code frag)HY(ment)YH( shows the type
+ defi)HY(ni)HY(tions)YH( as well as the acces)HY(sor)YH( and modi)HY(fier)YH( func)HY(tions)YH( that
+ are gener)HY(ated)YH( for this element in the )SM(person_t)ES( class:)EP(
+
+ ) 19 63 PR(class person_t
+{
+ // middle-name
+ //
+ typedef xml_schema::string middle_name_type;
+ typedef xsd::optional<middle_name_type> middle_name_optional;
+
+ const middle_name_optional&
+ middle_name \201\202 const;
+
+ middle_name_optional&
+ middle_name \201\202;
+
+ void
+ middle_name \201const middle_name_type&\202;
+
+ void
+ middle_name \201const middle_name_optional&\202;
+};)RP(
+
+ )0 P(As with the )SM(gender)ES( element, )SM(middle_name_type)ES(
+ is an alias for the element's type. The )SM(middle_name_optional)ES(
+ type is a container for the element's optional value. It can be queried
+ for the pres)HY(ence)YH( of the value using the )SM(present\201\202)ES( func)HY(tion)YH(.
+ The value itself can be retrieved using the )SM(get\201\202)ES(
+ acces)HY(sor)YH( and set using the )SM(set\201\202)ES( modi)HY(fier)YH(. The container
+ can be reverted to the value not present state with the call to the
+ )SM(reset\201\202)ES( func)HY(tion)YH(. The follow)HY(ing)YH( example shows how we
+ can use this container:)EP(
+
+ ) 9 42 PR(person_t::middle_name_optional n \201"John"\202;
+
+if \201n.preset \201\202\202
+{
+ cout << n.get \201\202 << endl;
+}
+
+n.set \201"Jane"\202;
+n.reset \201\202;)RP(
+
+
+ )0 P(Unlike the )EM(one)ES( cardi)HY(nal)HY(ity)YH( class, the acces)HY(sor)YH( func)HY(tions)YH(
+ for the )EM(optional)ES( class return read-only \201constant\202 and
+ read-write refer)HY(ences)YH( to the container instead of the element's
+ value directly. The modi)HY(fier)YH( func)HY(tions)YH( set the new value for the
+ element.)EP(
+
+ )0 P(Finally, the )EM(sequence)ES( cardi)HY(nal)HY(ity)YH( class covers all elements
+ that can occur more than once. In our example, the
+ )SM(person)ES( element in the )SM(people_t)ES( type
+ belongs to this cardi)HY(nal)HY(ity)YH( class. The follow)HY(ing)YH( code frag)HY(ment)YH( shows
+ the type defi)HY(ni)HY(tions)YH( as well as the acces)HY(sor)YH( and modi)HY(fier)YH( func)HY(tions)YH(
+ that are gener)HY(ated)YH( for this element in the )SM(people_t)ES(
+ class:)EP(
+
+ ) 18 64 PR(class people_t
+{
+ // person
+ //
+ typedef person_t person_type;
+ typedef xsd::sequence<person_type> person_sequence;
+ typedef person_sequence::iterator person_iterator;
+ typedef person_sequence::const_iterator person_const_iterator;
+
+ const person_sequence&
+ person \201\202 const;
+
+ person_sequence&
+ person \201\202;
+
+ void
+ person \201const person_sequence&\202;
+};)RP(
+
+ )0 P(Iden)HY(ti)HY(cal)YH( to the other cardi)HY(nal)HY(ity)YH( classes, )SM(person_type)ES(
+ is an alias for the element's type. The )SM(person_sequence)ES(
+ type is a sequence container for the element's values. It is based
+ on and has the same inter)HY(face)YH( as )SM(std::vector)ES( and
+ there)HY(fore)YH( can be used in similar ways. The )SM(person_iter)HY(a)HY(tor)YH()ES(
+ and )SM(person_const_iter)HY(a)HY(tor)YH()ES( types are read-only
+ \201constant\202 and read-write iter)HY(a)HY(tors)YH( for the )SM(person_sequence)ES(
+ container.)EP(
+
+ )0 P(Similar to the )EM(optional)ES( cardi)HY(nal)HY(ity)YH( class, the
+ acces)HY(sor)YH( func)HY(tions)YH( for the )EM(sequence)ES( class return
+ read-only \201constant\202 and read-write refer)HY(ences)YH( to the sequence
+ container. The modi)HY(fier)YH( func)HY(tions)YH( copies the entries from
+ the passed sequence.)EP(
+
+ )0 P(For complex schemas with many levels of nested compos)HY(i)HY(tors)YH(
+ \201)SM(xs:choice)ES( and )SM(xs:sequence)ES(\202 it can
+ be hard to deduce the cardi)HY(nal)HY(ity)YH( class of a partic)HY(u)HY(lar)YH( element.
+ The gener)HY(ated)YH( Doxygen docu)HY(men)HY(ta)HY(tion)YH( can greatly help with
+ this task. For each element and attribute the docu)HY(men)HY(ta)HY(tion)YH(
+ clearly iden)HY(ti)HY(fies)YH( its cardi)HY(nal)HY(ity)YH( class. Alter)HY(na)HY(tively)YH(, you
+ can study the gener)HY(ated)YH( header files to find out the cardi)HY(nal)HY(ity)YH(
+ class of a partic)HY(u)HY(lar)YH( attribute or element. In the next sections
+ we will examine how to access and modify infor)HY(ma)HY(tion)YH( stored in
+ an object model using acces)HY(sor)YH( and modi)HY(fier)YH( func)HY(tions)YH( described
+ in this section.)EP(
+
+
+ )0 2 21 H(4.2)WB 56 Sn()WB 24 Sn( Access)HY(ing)YH( the Object Model)EA()EH(
+
+ )0 P(In this section we will learn how to get to the infor)HY(ma)HY(tion)YH(
+ stored in the object model for our person records vocab)HY(u)HY(lary)YH(.
+ The follow)HY(ing)YH( appli)HY(ca)HY(tion)YH( accesses and prints the contents
+ of the )SM(people.xml)ES( file:)EP(
+
+ ) 36 70 PR(#include <iostream>
+#include "people.hxx"
+
+using namespace std;
+
+int
+main \201\202
+{
+ auto_ptr<people_t> ppl \201people \201"people.xml"\202\202;
+
+ // Iterate over individual person records.
+ //
+ people_t::person_sequence& ps \201ppl->person \201\202\202;
+
+ for \201people_t::person_iterator i \201ps.begin \201\202\202; i != ps.end \201\202; ++i\202
+ {
+ person_t& p \201*i\202;
+
+ // Print names: first-name and last-name are required elements,
+ // middle-name is optional.
+ //
+ cout << "name: " << p.first_name \201\202 << " ";
+
+ if \201p.middle_name \201\202.present \201\202\202
+ cout << p.middle_name \201\202.get \201\202 << " ";
+
+ cout << p.last_name \201\202 << endl;
+
+ // Print gender, age, and id which are all required.
+ //
+ cout << "gender: " << p.gender \201\202 << endl)WR(
+ << "age: " << p.age \201\202 << endl
+ << "id: " << p.id \201\202 << endl
+ << endl;
+ }
+})RP(
+
+ )0 P(This code shows common patterns of access)HY(ing)YH( elements and attributes
+ with differ)HY(ent)YH( cardi)HY(nal)HY(ity)YH( classes. For the sequence element
+ \201)SM(person)ES( in )SM(people_t)ES(\202 we first obtain a
+ refer)HY(ence)YH( to the container and then iterate over indi)HY(vid)HY(ual)YH(
+ records. The values of elements and attributes with the
+ )EM(one)ES( cardi)HY(nal)HY(ity)YH( class \201)SM(first-name)ES(,
+ )SM(last-name)ES(, )SM(gender)ES(, )SM(age)ES(,
+ and )SM(id)ES(\202 can be obtained directly by calling the
+ corre)HY(spond)HY(ing)YH( acces)HY(sor)YH( func)HY(tions)YH(. For the optional element
+ )SM(middle-name)ES( we first check if the value is present
+ and only then call )SM(get\201\202)ES( to retrieve it.)EP(
+
+ )0 P(Note that when we want to reduce typing by creat)HY(ing)YH( a vari)HY(able)YH(
+ repre)HY(sent)HY(ing)YH( a frag)HY(ment)YH( of the object model that we are currently
+ working with \201)SM(ps)ES( and )SM(p)ES( above\202, we obtain
+ a refer)HY(ence)YH( to that frag)HY(ment)YH( instead of making a poten)HY(tially)YH(
+ expen)HY(sive)YH( copy. This is gener)HY(ally)YH( a good rule to follow when
+ creat)HY(ing)YH( high-perfor)HY(mance)YH( appli)HY(ca)HY(tions)YH(.)EP(
+
+ )0 P(If we run the above appli)HY(ca)HY(tion)YH( on our sample
+ )SM(people.xml)ES(, the output looks as follows:)EP(
+
+ ) 9 21 PR(name: John Doe
+gender: male
+age: 32
+id: 1
+
+name: Jane Mary Doe
+gender: female
+age: 28
+id: 2)RP(
+
+
+ )0 2 22 H(4.3)WB 57 Sn()WB 25 Sn( Modi)HY(fy)HY(ing)YH( the Object Model)EA()EH(
+
+ )0 P(In this section we will learn how to modify the infor)HY(ma)HY(tion)YH(
+ stored in the object model for our person records vocab)HY(u)HY(lary)YH(.
+ The follow)HY(ing)YH( appli)HY(ca)HY(tion)YH( changes the contents of the
+ )SM(people.xml)ES( file:)EP(
+
+ ) 43 70 PR(#include <iostream>
+#include "people.hxx"
+
+using namespace std;
+
+int
+main \201\202
+{
+ auto_ptr<people_t> ppl \201people \201"people.xml"\202\202;
+
+ // Iterate over individual person records and increment
+ // the age.
+ //
+ people_t::person_sequence& ps \201ppl->person \201\202\202;
+
+ for \201people_t::person_iterator i \201ps.begin \201\202\202; i != ps.end \201\202; ++i\202
+ {
+ // Alternative way: i->age \201\202++;
+ //
+ i->age \201i->age \201\202 + 1\202;
+ }
+
+ // Add middle-name to the first record and remove it from
+ // the second.
+ //
+ person_t& john \201ps[0]\202;
+ person_t& jane \201ps[1]\202;
+
+ john.middle_name \201"Mary"\202;
+ jane.middle_name \201\202.reset \201\202;
+)WR(
+ // Add another John record.
+ //
+ ps.push_back \201john\202;
+
+ // Serialize the modified object model to XML.
+ //
+ xml_schema::namespace_infomap map;
+ map[""].name = "";
+ map[""].schema = "people.xsd";
+
+ people \201cout, *ppl, map\202;
+})RP(
+
+ )0 P(The first modi)HY(fi)HY(ca)HY(tion)YH( the above appli)HY(ca)HY(tion)YH( performs is iter)HY(at)HY(ing)YH(
+ over person records and incre)HY(ment)HY(ing)YH( the age value. This code
+ frag)HY(ment)YH( shows how to modify the value of a required attribute
+ or element. The next modi)HY(fi)HY(ca)HY(tion)YH( shows how to set a new value
+ for the optional )SM(middle-name)ES( element as well
+ as clear its value. Finally the example adds a copy of the
+ John Doe record to the )SM(person)ES( element sequence.)EP(
+
+ )0 P(Note that in this case using refer)HY(ences)YH( for the )SM(ps)ES(,
+ )SM(john)ES(, and )SM(jane)ES( vari)HY(ables)YH( is no longer
+ a perfor)HY(mance)YH( improve)HY(ment)YH( but a require)HY(ment)YH( for the appli)HY(ca)HY(tion)YH(
+ to func)HY(tion)YH( correctly. If we hadn't used refer)HY(ences)YH(, all our changes
+ would have been made on copies without affect)HY(ing)YH( the object model.)EP(
+
+ )0 P(If we run the above appli)HY(ca)HY(tion)YH( on our sample )SM(people.xml)ES(,
+ the output looks as follows:)EP(
+
+ ) 28 61 PR(<?xml version="1.0"?>
+<people xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:noNamespaceSchemaLocation="people.xsd">
+
+ <person id="1">
+ <first-name>John</first-name>
+ <middle-name>Mary</middle-name>
+ <last-name>Doe</last-name>
+ <gender>male</gender>
+ <age>33</age>
+ </person>
+
+ <person id="2">
+ <first-name>Jane</first-name>
+ <last-name>Doe</last-name>
+ <gender>female</gender>
+ <age>29</age>
+ </person>
+
+ <person id="1">
+ <first-name>John</first-name>
+ <middle-name>Mary</middle-name>
+ <last-name>Doe</last-name>
+ <gender>male</gender>
+ <age>33</age>
+ </person>
+
+</people>)RP(
+
+
+ )0 2 23 H(4.4)WB 58 Sn()WB 26 Sn( Creat)HY(ing)YH( the Object Model from Scratch)EA()EH(
+
+ )0 P(In this section we will learn how to create a new object model
+ for our person records vocab)HY(u)HY(lary)YH(. The follow)HY(ing)YH( appli)HY(ca)HY(tion)YH(
+ recre)HY(ates)YH( the content of the orig)HY(i)HY(nal)YH( )SM(people.xml)ES(
+ file:)EP(
+
+ ) 42 48 PR(#include <iostream>
+#include "people.hxx"
+
+using namespace std;
+
+int
+main \201\202
+{
+ people_t ppl;
+ people_t::person_sequence& ps \201ppl.person \201\202\202;
+
+ // Add the John Doe record.
+ //
+ ps.push_back \201
+ person_t \201"John", // first-name
+ "Doe", // last-name
+ gender_t::male, // gender
+ 32, // age
+ 1\202\202;
+
+ // Add the Jane Doe record.
+ //
+ ps.push_back \201
+ person_t \201"Jane", // first-name
+ "Doe", // last-name
+ gender_t::female, // gender
+ 28, // age
+ 2\202\202; // id
+
+ // Add middle name to the Jane Doe record.
+ //)WR(
+ person_t& jane \201ps.back \201\202\202;
+ jane.middle_name \201"Mary"\202;
+
+ // Serialize the object model to XML.
+ //
+ xml_schema::namespace_infomap map;
+ map[""].name = "";
+ map[""].schema = "people.xsd";
+
+ people \201cout, ppl, map\202;
+})RP(
+
+ )0 P(The only new part in the above appli)HY(ca)HY(tion)YH( is the calls
+ to the )SM(people_t)ES( and )SM(person_t)ES(
+ construc)HY(tors)YH(. As a general rule, for each C++ class
+ XSD gener)HY(ates)YH( a construc)HY(tor)YH( with initial)HY(iz)HY(ers)YH(
+ for each element and attribute belong)HY(ing)YH( to the )EM(one)ES(
+ cardi)HY(nal)HY(ity)YH( class. For our vocab)HY(u)HY(lary)YH(, the follow)HY(ing)YH(
+ construc)HY(tors)YH( are gener)HY(ated)YH(:)EP(
+
+ ) 13 35 PR(class person_t
+{
+ person_t \201const first_name_type&,
+ const last_name_type&,
+ const gender_type&,
+ const age_type&,
+ const id_type&\202;
+};
+
+class people_t
+{
+ people_t \201\202;
+};)RP(
+
+ )0 P(Note also that we set the )SM(middle-name)ES( element
+ on the Jane Doe record by obtain)HY(ing)YH( a refer)HY(ence)YH( to that record
+ in the object model and setting the )SM(middle-name)ES(
+ value on it. This is a general rule that should be followed
+ in order to obtain the best perfor)HY(mance)YH(: if possi)HY(ble)YH(,
+ direct modi)HY(fi)HY(ca)HY(tions)YH( to the object model should be preferred
+ to modi)HY(fi)HY(ca)HY(tions)YH( on tempo)HY(raries)YH( with subse)HY(quent)YH( copying. The
+ follow)HY(ing)YH( code frag)HY(ment)YH( shows a seman)HY(ti)HY(cally)YH( equiv)HY(a)HY(lent)YH( but
+ slightly slower version:)EP(
+
+ ) 11 46 PR(// Add the Jane Doe record.
+//
+person_t jane \201"Jane", // first-name
+ "Doe", // last-name
+ gender_t::female, // gender
+ 28, // age
+ 2\202; // id
+
+jane.middle_name \201"Mary"\202;
+
+ps.push_back \201jane\202;)RP(
+
+ )0 P(We can also go one step further to reduce copying and improve
+ the perfor)HY(mance)YH( of our appli)HY(ca)HY(tion)YH( by using the non-copying
+ )SM(push_back\201\202)ES( func)HY(tion)YH( which assumes owner)HY(ship)YH(
+ of the passed objects:)EP(
+
+ ) 19 47 PR(// Add the John Doe record.
+//
+auto_ptr<person_t> john_p \201
+ new person_t \201"John", // first-name
+ "Doe", // last-name
+ gender_t::male, // gender
+ 32, // age
+ 1\202\202;
+ps.push_back \201john_p\202; // assumes ownership
+
+// Add the Jane Doe record.
+//
+auto_ptr<person_t> jane_p \201
+ new person_t \201"Jane", // first-name
+ "Doe", // last-name
+ gender_t::female, // gender
+ 28, // age
+ 2\202\202; // id
+ps.push_back \201jane_p\202; // assumes ownership)RP(
+
+ )0 P(For more infor)HY(ma)HY(tion)YH( on the non-copying modi)HY(fier)YH( func)HY(tions)YH( refer to
+ )R12 2 A(Section
+ 2.8, "Mapping for Local Elements and Attributes")EA( in the C++/Tree Mapping
+ User Manual. The above appli)HY(ca)HY(tion)YH( produces the follow)HY(ing)YH( output:)EP(
+
+ ) 20 61 PR(<?xml version="1.0" ?>
+<people xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:noNamespaceSchemaLocation="people.xsd">
+
+ <person id="1">
+ <first-name>John</first-name>
+ <last-name>Doe</last-name>
+ <gender>male</gender>
+ <age>32</age>
+ </person>
+
+ <person id="2">
+ <first-name>Jane</first-name>
+ <middle-name>Mary</middle-name>
+ <last-name>Doe</last-name>
+ <gender>female</gender>
+ <age>28</age>
+ </person>
+
+</people>)RP(
+
+ )0 2 24 H(4.5)WB 59 Sn()WB 27 Sn( Mapping for the Built-in XML Schema Types)EA()EH(
+
+ )0 P(Our person record vocab)HY(u)HY(lary)YH( uses several built-in XML Schema
+ types: )SM(string)ES(, )SM(short)ES(, and
+ )SM(unsignedInt)ES(. Until now we haven't talked about
+ the mapping of built-in XML Schema types to C++ types and how
+ to work with them. This section provides an overview
+ of the built-in types. For more detailed infor)HY(ma)HY(tion)YH( refer
+ to )R13 2 A(Section
+ 2.5, "Mapping for Built-in Data Types")EA( in the C++/Tree Mapping
+ User Manual.)EP(
+
+ )0 P(In XML Schema, built-in types are defined in the XML Schema names)HY(pace)YH(.
+ By default, the C++/Tree mapping maps this names)HY(pace)YH( to C++
+ names)HY(pace)YH( )SM(xml_schema)ES( \201this mapping can be altered
+ with the )SM(--names)HY(pace)YH(-map)ES( option\202. The follow)HY(ing)YH( table
+ summa)HY(rizes)YH( the mapping of XML Schema built-in types to C++ types:)EP(
+
+
+ )0 PT(
+
+ )0 P(As you can see from the table above a number of built-in
+ XML Schema types are mapped to funda)HY(men)HY(tal)YH( C++ types such
+ as )SM(int)ES( or )SM(bool)ES(. All string-based
+ XML Schema types are mapped to C++ types that are derived
+ from either )SM(std::string)ES( or
+ )SM(std::wstring)ES(, depend)HY(ing)YH( on the char)HY(ac)HY(ter)YH(
+ type selected. For access and modi)HY(fi)HY(ca)HY(tion)YH( purposes these
+ types can be treated as )SM(std::string)ES(. A number
+ of built-in types, such as )SM(qname)ES(, the binary
+ types, and the date/time types do not have suit)HY(able)YH(
+ funda)HY(men)HY(tal)YH( or stan)HY(dard)YH( C++ types to map to. As a result,
+ these types are imple)HY(mented)YH( from scratch in the XSD runtime.
+ For more infor)HY(ma)HY(tion)YH( on their inter)HY(faces)YH( refer to
+ )R13 2 A(Section
+ 2.5, "Mapping for Built-in Data Types")EA( in the C++/Tree Mapping
+ User Manual.)EP(
+
+
+
+
+
+ )0 1 25 H(5)WB 60 Sn()WB 29 Sn( Parsing)EA()EH(
+
+ )0 P(We have already seen how to parse XML to an object model in this guide
+ before. In this chapter we will discuss the parsing topic in more
+ detail.)EP(
+
+ )0 P(By default, the C++/Tree mapping provides a total of 14 over)HY(loaded)YH(
+ parsing func)HY(tions)YH(. They differ in the input methods used to
+ read XML as well as the error report)HY(ing)YH( mech)HY(a)HY(nisms)YH(. It is also possi)HY(ble)YH(
+ to gener)HY(ate)YH( types for root elements instead of parsing and seri)HY(al)HY(iza)HY(tion)YH(
+ func)HY(tions)YH(. This may be useful if your XML vocab)HY(u)HY(lary)YH( has multi)HY(ple)YH(
+ root elements. For more infor)HY(ma)HY(tion)YH( on element types refer to
+ )R14 2 A(Section
+ 2.9, "Mapping for Global Elements")EA( in the C++/Tree Mapping User
+ Manual.)EP(
+
+
+ )0 P(In this section we will discuss the most commonly used versions of
+ the parsing func)HY(tions)YH(. For a compre)HY(hen)HY(sive)YH( descrip)HY(tion)YH( of parsing
+ refer to )R15 2 A(Chapter
+ 3, "Parsing")EA( in the C++/Tree Mapping User Manual. For the )SM(people)ES(
+ global element from our person record vocab)HY(u)HY(lary)YH(, we will concen)HY(trate)YH(
+ on the follow)HY(ing)YH( three parsing func)HY(tions)YH(:)EP(
+
+ ) 15 71 PR(std::auto_ptr<people_t>
+people \201const std::string& uri,
+ xml_schema::flags f = 0,
+ const xml_schema::properties& p = xml_schema::properties \201\202\202;
+
+std::auto_ptr<people_t>
+people \201std::istream& is,
+ xml_schema::flags f = 0,
+ const xml_schema::properties& p = xml_schema::properties \201\202\202;
+
+std::auto_ptr<people_t>
+people \201std::istream& is,
+ const std::string& resource_id,
+ xml_schema::flags f = 0,
+ const xml_schema::properties& p = ::xml_schema::properties \201\202\202;)RP(
+
+ )0 P(The first func)HY(tion)YH( parses a local file or a URI. We have already
+ used this parsing func)HY(tion)YH( in the previ)HY(ous)YH( chap)HY(ters)YH(. The second
+ and third func)HY(tions)YH( read XML from a stan)HY(dard)YH( input stream. The
+ last func)HY(tion)YH( also requires a resource id. This id is used to
+ iden)HY(tify)YH( the XML docu)HY(ment)YH( being parser in diag)HY(nos)HY(tics)YH( messages
+ as well as to resolve rela)HY(tive)YH( paths to other docu)HY(ments)YH( \201for example,
+ schemas\202 that might be refer)HY(enced)YH( from the XML docu)HY(ment)YH(.)EP(
+
+ )0 P(The last two argu)HY(ments)YH( to all three parsing func)HY(tions)YH( are parsing
+ flags and prop)HY(er)HY(ties)YH(. The flags argu)HY(ment)YH( provides a number of ways
+ to fine-tune the parsing process. The prop)HY(er)HY(ties)YH( argu)HY(ment)YH( allows
+ to pass addi)HY(tional)YH( infor)HY(ma)HY(tion)YH( to the parsing func)HY(tions)YH(. We will
+ use these two argu)HY(ments)YH( in )0 30 1 A(Section 5.1, "XML Schema
+ Vali)HY(da)HY(tion)YH( and Search)HY(ing)YH(")30 0 TN TL()Ec /AF f D( below. The follow)HY(ing)YH( example shows
+ how we can use the above parsing func)HY(tions)YH(:)EP(
+
+ ) 17 65 PR(using std::auto_ptr;
+
+// Parse a local file or URI.
+//
+auto_ptr<people_t> p1 \201people \201"people.xml"\202\202;
+auto_ptr<people_t> p2 \201people \201"http://example.com/people.xml"\202\202;
+
+// Parse a local file via ifstream.
+//
+std::ifstream ifs \201"people.xml"\202;
+auto_ptr<people_t> p3 \201people \201ifs, "people.xml"\202\202;
+
+// Parse an XML string.
+//
+std::string str \201"..."\202; // XML in a string.
+std::istringstream iss \201str\202;
+auto_ptr<people_t> p4 \201people \201iss\202\202;)RP(
+
+
+ )0 2 26 H(5.1)WB 61 Sn()WB 30 Sn( XML Schema Vali)HY(da)HY(tion)YH( and Search)HY(ing)YH()EA()EH(
+
+ )0 P(The C++/Tree mapping relies on the under)HY(ly)HY(ing)YH( Xerces-C++ XML
+ parser for full XML docu)HY(ment)YH( vali)HY(da)HY(tion)YH(. The XML Schema
+ vali)HY(da)HY(tion)YH( is enabled by default and can be disabled by
+ passing the )SM(xml_schema::flags::dont_vali)HY(date)YH()ES(
+ flag to the parsing func)HY(tions)YH(, for example:)EP(
+
+ ) 2 59 PR(auto_ptr<people_t> p \201
+ people \201"people.xml", xml_schema::flags::dont_validate\202\202;)RP(
+
+ )0 P(Even when XML Schema vali)HY(da)HY(tion)YH( is disabled, the gener)HY(ated)YH(
+ code still performs a number of checks to prevent
+ construc)HY(tion)YH( of an incon)HY(sis)HY(tent)YH( object model \201for example, an
+ object model with missing required attributes or elements\202.)EP(
+
+ )0 P(When XML Schema vali)HY(da)HY(tion)YH( is enabled, the XML parser needs
+ to locate a schema to vali)HY(date)YH( against. There are several
+ methods to provide the schema loca)HY(tion)YH( infor)HY(ma)HY(tion)YH( to the
+ parser. The easiest and most commonly used method is to
+ specify schema loca)HY(tions)YH( in the XML docu)HY(ment)YH( itself
+ with the )SM(schemaLo)HY(ca)HY(tion)YH()ES( or
+ )SM(noNames)HY(paceSchemaLo)HY(ca)HY(tion)YH()ES( attributes, for example:)EP(
+
+ ) 4 74 PR(<?xml version="1.0" ?>
+<people xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:noNamespaceSchemaLocation="people.xsd"
+ xsi:schemaLocation="http://www.w3.org/XML/1998/namespace xml.xsd">)RP(
+
+ )0 P(As you might have noticed, we used this method in all the sample XML
+ docu)HY(ments)YH( presented in this guide up until now. Note that the
+ schema loca)HY(tions)YH( spec)HY(i)HY(fied)YH( with these two attributes are rela)HY(tive)YH(
+ to the docu)HY(ment)YH('s path unless they are abso)HY(lute)YH( URIs \201that is
+ start with )SM(http://)ES(, )SM(file://)ES(, etc.\202.
+ In partic)HY(u)HY(lar)YH(, if you specify just file names as your schema
+ loca)HY(tions)YH(, as we did above, then the schemas should reside in
+ the same direc)HY(tory)YH( as the XML docu)HY(ment)YH( itself.)EP(
+
+ )0 P(Another method of provid)HY(ing)YH( the schema loca)HY(tion)YH( infor)HY(ma)HY(tion)YH(
+ is via the )SM(xml_schema::prop)HY(er)HY(ties)YH()ES( argu)HY(ment)YH(, as
+ shown in the follow)HY(ing)YH( example:)EP(
+
+ ) 5 74 PR(xml_schema::properties props;
+props.no_namespace_schema_location \201"people.xsd"\202;
+props.schema_location \201"http://www.w3.org/XML/1998/namespace", "xml.xsd"\202;
+
+auto_ptr<people_t> p \201people \201"people.xml", 0, props\202\202;)RP(
+
+ )0 P(The schema loca)HY(tions)YH( provided with this method over)HY(rides)YH(
+ those spec)HY(i)HY(fied)YH( in the XML docu)HY(ment)YH(. As with the previ)HY(ous)YH(
+ method, the schema loca)HY(tions)YH( spec)HY(i)HY(fied)YH( this way are
+ rela)HY(tive)YH( to the docu)HY(ment)YH('s path unless they are abso)HY(lute)YH( URIs.
+ In partic)HY(u)HY(lar)YH(, if you want to use local schemas that are
+ not related to the docu)HY(ment)YH( being parsed, then you will
+ need to use the )SM(file://)ES( URI. The follow)HY(ing)YH(
+ example shows how to use schemas that reside in the current
+ working direc)HY(tory)YH(:)EP(
+
+ ) 19 55 PR(#include <unistd.h> // getcwd
+#include <limits.h> // PATH_MAX
+
+char cwd[PATH_MAX];
+if \201getcwd \201cwd, PATH_MAX\202 == 0\202
+{
+ // Buffer too small?
+}
+
+xml_schema::properties props;
+
+props.no_namespace_schema_location \201
+ "file:///" + std::string \201cwd\202 + "people.xsd"\202;
+
+props.schema_location \201
+ "http://www.w3.org/XML/1998/namespace",
+ "file:///" + std::string \201cwd\202 + "xml.xsd"\202;
+
+auto_ptr<people_t> p \201people \201"people.xml", 0, props\202\202;)RP(
+
+ )0 P(A third method is the most useful if you are plan)HY(ning)YH( to parse
+ several XML docu)HY(ments)YH( of the same vocab)HY(u)HY(lary)YH(. In that case
+ it may be bene)HY(fi)HY(cial)YH( to pre-parse and cache the schemas in
+ the XML parser which can then be used to parse all docu)HY(ments)YH(
+ without re-parsing the schemas. For more infor)HY(ma)HY(tion)YH( on
+ this method refer to the )SM(caching)ES( example in the
+ )SM(exam)HY(ples)YH(/cxx/tree/)ES( direc)HY(tory)YH( of the XSD
+ distri)HY(bu)HY(tion)YH(. It is also possi)HY(ble)YH( to convert the schemas into
+ a pre-compiled binary repre)HY(sen)HY(ta)HY(tion)YH( and embed this repre)HY(sen)HY(ta)HY(tion)YH(
+ directly into the appli)HY(ca)HY(tion)YH( executable. With this approach your
+ appli)HY(ca)HY(tion)YH( can perform XML Schema vali)HY(da)HY(tion)YH( without depend)HY(ing)YH( on
+ any exter)HY(nal)YH( schema files. For more infor)HY(ma)HY(tion)YH( on how to achieve
+ this refer to the )SM(embed)HY(ded)YH()ES( example in the
+ )SM(exam)HY(ples)YH(/cxx/tree/)ES( direc)HY(tory)YH( of the XSD distri)HY(bu)HY(tion)YH(.)EP(
+
+ )0 P(When the XML parser cannot locate a schema for the
+ XML docu)HY(ment)YH(, the vali)HY(da)HY(tion)YH( fails and XML docu)HY(ment)YH(
+ elements and attributes for which schema defi)HY(ni)HY(tions)YH( could
+ not be located are reported in the diag)HY(nos)HY(tics)YH(. For
+ example, if we remove the )SM(noNames)HY(paceSchemaLo)HY(ca)HY(tion)YH()ES(
+ attribute in )SM(people.xml)ES( from the previ)HY(ous)YH( chapter,
+ then we will get the follow)HY(ing)YH( diag)HY(nos)HY(tics)YH( if we try to parse
+ this file with vali)HY(da)HY(tion)YH( enabled:)EP(
+
+ ) 8 74 PR(people.xml:2:63 error: no declaration found for element 'people'
+people.xml:4:18 error: no declaration found for element 'person'
+people.xml:4:18 error: attribute 'id' is not declared for element 'person'
+people.xml:5:17 error: no declaration found for element 'first-name'
+people.xml:6:18 error: no declaration found for element 'middle-name'
+people.xml:7:16 error: no declaration found for element 'last-name'
+people.xml:8:13 error: no declaration found for element 'gender'
+people.xml:9:10 error: no declaration found for element 'age')RP(
+
+ )0 2 27 H(5.2)WB 62 Sn()WB 31 Sn( Error Handling)EA()EH(
+
+ )0 P(The parsing func)HY(tions)YH( offer a number of ways to handle error condi)HY(tions)YH(
+ with the C++ excep)HY(tions)YH( being the most commonly used mech)HY(a)HY(nism)YH(. All
+ C++/Tree excep)HY(tions)YH( derive from common base )SM(xml_schema::excep)HY(tion)YH()ES(
+ which in turn derives from )SM(std::excep)HY(tion)YH()ES(. The easiest
+ way to uniformly handle all possi)HY(ble)YH( C++/Tree excep)HY(tions)YH( and print
+ detailed infor)HY(ma)HY(tion)YH( about the error is to catch and print
+ )SM(xml_schema::excep)HY(tion)YH()ES(, as shown in the follow)HY(ing)YH(
+ example:)EP(
+
+ ) 8 47 PR(try
+{
+ auto_ptr<people_t> p \201people \201"people.xml"\202\202;
+}
+catch \201const xml_schema::exception& e\202
+{
+ cerr << e << endl;
+})RP(
+
+ )0 P(Each indi)HY(vid)HY(ual)YH( C++/Tree excep)HY(tion)YH( also allows you to obtain
+ error details program)HY(mat)HY(i)HY(cally)YH(. For example, the
+ )SM(xml_schema::parsing)ES( excep)HY(tion)YH( is thrown when
+ the XML parsing and vali)HY(da)HY(tion)YH( in the under)HY(ly)HY(ing)YH( XML parser
+ fails. It encap)HY(su)HY(lates)YH( various diag)HY(nos)HY(tics)YH( infor)HY(ma)HY(tion)YH(
+ such as the file name, line and column numbers, as well as the
+ error or warning message for each entry. For more infor)HY(ma)HY(tion)YH(
+ about this and other excep)HY(tions)YH( that can be thrown during
+ parsing, refer to
+ )R16 2 A(Section
+ 3.3, "Error Handling")EA( in the C++/Tree Mapping
+ User Manual.)EP(
+
+ )0 P(Note that if you are parsing )SM(std::istream)ES( on which
+ excep)HY(tions)YH( are not enabled, then you will need to check the
+ stream state after the call to the parsing func)HY(tion)YH( in order
+ to detect any possi)HY(ble)YH( stream fail)HY(ures)YH(, for example:)EP(
+
+ ) 15 50 PR(std::ifstream ifs \201"people.xml"\202;
+
+if \201ifs.fail \201\202\202
+{
+ cerr << "people.xml: unable to open" << endl;
+ return 1;
+}
+
+auto_ptr<people_t> p \201people \201ifs, "people.xml"\202\202;
+
+if \201ifs.fail \201\202\202
+{
+ cerr << "people.xml: read error" << endl;
+ return 1;
+})RP(
+
+ )0 P(The above example can be rewrit)HY(ten)YH( to use excep)HY(tions)YH( as
+ shown below:)EP(
+
+ ) 13 66 PR(try
+{
+ std::ifstream ifs;
+ ifs.exceptions \201std::ifstream::badbit | std::ifstream::failbit\202;
+ ifs.open \201"people.xml"\202;
+
+ auto_ptr<people_t> p \201people \201ifs, "people.xml"\202\202;
+}
+catch \201const std::ifstream::failure&\202
+{
+ cerr << "people.xml: unable to open or read error" << endl;
+ return 1;
+})RP(
+
+
+
+
+
+ )0 1 28 H(6)WB 63 Sn()WB 32 Sn( Seri)HY(al)HY(iza)HY(tion)YH()EA()EH(
+
+ )0 P(We have already seen how to seri)HY(al)HY(ize)YH( an object model back to XML
+ in this guide before. In this chapter we will discuss the
+ seri)HY(al)HY(iza)HY(tion)YH( topic in more detail.)EP(
+
+ )0 P(By default, the C++/Tree mapping provides a total of 8 over)HY(loaded)YH(
+ seri)HY(al)HY(iza)HY(tion)YH( func)HY(tions)YH(. They differ in the output methods used to write
+ XML as well as the error report)HY(ing)YH( mech)HY(a)HY(nisms)YH(. It is also possi)HY(ble)YH( to
+ gener)HY(ate)YH( types for root elements instead of parsing and seri)HY(al)HY(iza)HY(tion)YH(
+ func)HY(tions)YH(. This may be useful if your XML vocab)HY(u)HY(lary)YH( has multi)HY(ple)YH(
+ root elements. For more infor)HY(ma)HY(tion)YH( on element types refer to
+ )R14 2 A(Section
+ 2.9, "Mapping for Global Elements")EA( in the C++/Tree Mapping User
+ Manual.)EP(
+
+
+ )0 P(In this section we will discuss the most commonly
+ used version of seri)HY(al)HY(iza)HY(tion)YH( func)HY(tions)YH(. For a compre)HY(hen)HY(sive)YH( descrip)HY(tion)YH(
+ of seri)HY(al)HY(iza)HY(tion)YH( refer to
+ )R17 2 A(Chapter
+ 4, "Seri)HY(al)HY(iza)HY(tion)YH(")EA( in the C++/Tree Mapping User Manual. For the
+ )SM(people)ES( global element from our person record vocab)HY(u)HY(lary)YH(,
+ we will concen)HY(trate)YH( on the follow)HY(ing)YH( seri)HY(al)HY(iza)HY(tion)YH( func)HY(tion)YH(:)EP(
+
+ ) 7 50 PR(void
+people \201std::ostream& os,
+ const people_t& x,
+ const xml_schema::namespace_infomap& map =
+ xml_schema::namespace_infomap \201\202,
+ const std::string& encoding = "UTF-8",
+ xml_schema::flags f = 0\202;)RP(
+
+ )0 P(This func)HY(tion)YH( seri)HY(al)HY(izes)YH( the object model passed as the second
+ argu)HY(ment)YH( to the stan)HY(dard)YH( output stream passed as the first
+ argu)HY(ment)YH(. The third argu)HY(ment)YH( is a names)HY(pace)YH( infor)HY(ma)HY(tion)YH( map
+ which we will discuss in more detail in the next section.
+ The fourth argu)HY(ment)YH( is a char)HY(ac)HY(ter)YH( encod)HY(ing)YH( that the result)HY(ing)YH(
+ XML docu)HY(ment)YH( should be in. Possi)HY(ble)YH( valid values for this
+ argu)HY(ment)YH( are "US-ASCII", "ISO8859-1", "UTF-8", "UTF-16BE",
+ "UTF-16LE", "UCS-4BE", and "UCS-4LE". Finally, the flags
+ argu)HY(ment)YH( allows fine-tuning of the seri)HY(al)HY(iza)HY(tion)YH( process.
+ The follow)HY(ing)YH( example shows how we can use the above seri)HY(al)HY(iza)HY(tion)YH(
+ func)HY(tion)YH(:)EP(
+
+ ) 19 34 PR(people_t& p = ...
+
+xml_schema::namespace_infomap map;
+map[""].schema = "people.xsd";
+
+// Serialize to stdout.
+//
+people \201std::cout, p, map\202;
+
+// Serialize to a file.
+//
+std::ofstream ofs \201"people.xml"\202;
+people \201ofs, p, map\202;
+
+// Serialize to a string.
+//
+std::ostringstream oss;
+people \201oss, p, map\202;
+std::string xml \201oss.str \201\202\202;)RP(
+
+
+ )0 2 29 H(6.1)WB 64 Sn()WB 33 Sn( Names)HY(pace)YH( and Schema Infor)HY(ma)HY(tion)YH()EA()EH(
+
+ )0 P(While XML seri)HY(al)HY(iza)HY(tion)YH( can be done just from the object
+ model alone, it is often desir)HY(able)YH( to assign mean)HY(ing)HY(ful)YH(
+ prefixes to XML names)HY(paces)YH( used in the vocab)HY(u)HY(lary)YH( as
+ well as to provide the schema loca)HY(tion)YH( infor)HY(ma)HY(tion)YH(.
+ This is accom)HY(plished)YH( by passing the names)HY(pace)YH( infor)HY(ma)HY(tion)YH(
+ map to the seri)HY(al)HY(iza)HY(tion)YH( func)HY(tion)YH(. The key in this map is
+ a names)HY(pace)YH( prefix that should be assigned to an XML names)HY(pace)YH(
+ spec)HY(i)HY(fied)YH( in the )SM(name)ES( vari)HY(able)YH( of the
+ map value. You can also assign an optional schema loca)HY(tion)YH( for
+ this names)HY(pace)YH( in the )SM(schema)ES( vari)HY(able)YH(. Based
+ on each key-value entry in this map, the seri)HY(al)HY(iza)HY(tion)YH(
+ func)HY(tion)YH( adds two attributes to the result)HY(ing)YH( XML docu)HY(ment)YH(:
+ the names)HY(pace)YH(-prefix mapping attribute and schema loca)HY(tion)YH(
+ attribute. The empty prefix indi)HY(cates)YH( that the names)HY(pace)YH(
+ should be mapped without a prefix. For example, the follow)HY(ing)YH(
+ map:)EP(
+
+ ) 7 55 PR(xml_schema::namespace_infomap map;
+
+map[""].name = "http://www.example.com/example";
+map[""].schema = "example.xsd";
+
+map["x"].name = "http://www.w3.org/XML/1998/namespace";
+map["x"].schema = "xml.xsd";)RP(
+
+ )0 P(Results in the follow)HY(ing)YH( XML docu)HY(ment)YH(:)EP(
+
+ ) 7 68 PR(<?xml version="1.0" ?>
+<example
+ xmlns="http://www.example.com/example"
+ xmlns:x="http://www.w3.org/XML/1998/namespace"
+ xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+ xsi:schemaLocation="http://www.example.com/example example.xsd
+ http://www.w3.org/XML/1998/namespace xml.xsd">)RP(
+
+ )0 P(The empty names)HY(pace)YH( indi)HY(cates)YH( that the vocab)HY(u)HY(lary)YH( has no target
+ names)HY(pace)YH(. For example, the follow)HY(ing)YH( map results in only the
+ )SM(noNames)HY(paceSchemaLo)HY(ca)HY(tion)YH()ES( attribute being added:)EP(
+
+ ) 4 34 PR(xml_schema::namespace_infomap map;
+
+map[""].name = "";
+map[""].schema = "example.xsd";)RP(
+
+ )0 2 30 H(6.2)WB 65 Sn()WB 34 Sn( Error Handling)EA()EH(
+
+ )0 P(Similar to the parsing func)HY(tions)YH(, the seri)HY(al)HY(iza)HY(tion)YH( func)HY(tions)YH( offer a
+ number of ways to handle error condi)HY(tions)YH( with the C++ excep)HY(tions)YH( being
+ the most commonly used mech)HY(a)HY(nisms)YH(. As with parsing, the easiest way to
+ uniformly handle all possi)HY(ble)YH( seri)HY(al)HY(iza)HY(tion)YH( excep)HY(tions)YH( and print
+ detailed infor)HY(ma)HY(tion)YH( about the error is to catch and print
+ )SM(xml_schema::excep)HY(tion)YH()ES(:)EP(
+
+ ) 13 38 PR(try
+{
+ people_t& p = ...
+
+ xml_schema::namespace_infomap map;
+ map[""].schema = "people.xsd";
+
+ people \201std::cout, p, map\202\202;
+}
+catch \201const xml_schema::exception& e\202
+{
+ cerr << e << endl;
+})RP(
+
+ )0 P(The most commonly encoun)HY(tered)YH( seri)HY(al)HY(iza)HY(tion)YH( excep)HY(tion)YH( is
+ )SM(xml_schema::seri)HY(al)HY(iza)HY(tion)YH()ES(. It is thrown
+ when the XML seri)HY(al)HY(iza)HY(tion)YH( in the under)HY(ly)HY(ing)YH( XML writer
+ fails. It encap)HY(su)HY(lates)YH( various diag)HY(nos)HY(tics)YH( infor)HY(ma)HY(tion)YH(
+ such as the file name, line and column numbers, as well as the
+ error or warning message for each entry. For more infor)HY(ma)HY(tion)YH(
+ about this and other excep)HY(tions)YH( that can be thrown during
+ seri)HY(al)HY(iza)HY(tion)YH(, refer to
+ )R18 2 A(Section
+ 4.4, "Error Handling")EA( in the C++/Tree Mapping
+ User Manual.)EP(
+
+ )0 P(Note that if you are seri)HY(al)HY(iz)HY(ing)YH( to )SM(std::ostream)ES( on
+ which excep)HY(tions)YH( are not enabled, then you will need to check the
+ stream state after the call to the seri)HY(al)HY(iza)HY(tion)YH( func)HY(tion)YH( in order
+ to detect any possi)HY(ble)YH( stream fail)HY(ures)YH(, for example:)EP(
+
+ ) 15 47 PR(std::ofstream ofs \201"people.xml"\202;
+
+if \201ofs.fail \201\202\202
+{
+ cerr << "people.xml: unable to open" << endl;
+ return 1;
+}
+
+people \201ofs, p, map\202\202;
+
+if \201ofs.fail \201\202\202
+{
+ cerr << "people.xml: write error" << endl;
+ return 1;
+})RP(
+
+ )0 P(The above example can be rewrit)HY(ten)YH( to use excep)HY(tions)YH( as
+ shown below:)EP(
+
+ ) 13 66 PR(try
+{
+ std::ofstream ofs;
+ ofs.exceptions \201std::ofstream::badbit | std::ofstream::failbit\202;
+ ofs.open \201"people.xml"\202;
+
+ people \201ofs, p, map\202\202;
+}
+catch \201const std::ofstream::failure&\202
+{
+ cerr << "people.xml: unable to open or write error" << endl;
+ return 1;
+})RP(
+
+ )BR(
+)BR(
+
+)WB NL
+/TE t D NP TU PM 0 eq and{/Pn () D showpage}if end restore