path: root/xsd/doc/xsd-epilogue.xhtml

  <h1>NAMING CONVENTION</h1>

  <p>The compiler can be instructed to use a particular naming
     convention in the generated code. A number of widely-used
     conventions can be selected using the <code><b>--type-naming</b></code>
     and <code><b>--function-naming</b></code> options. A custom
     naming convention can be achieved using the
     <code><b>--type-regex</b></code>,
     <code><b>--accessor-regex</b></code>,
     <code><b>--one-accessor-regex</b></code>,
     <code><b>--opt-accessor-regex</b></code>,
     <code><b>--seq-accessor-regex</b></code>,
     <code><b>--modifier-regex</b></code>,
     <code><b>--one-modifier-regex</b></code>,
     <code><b>--opt-modifier-regex</b></code>,
     <code><b>--seq-modifier-regex</b></code>,
     <code><b>--parser-regex</b></code>,
     <code><b>--serializer-regex</b></code>,
     <code><b>--const-regex</b></code>,
     <code><b>--enumerator-regex</b></code>, and
     <code><b>--element-type-regex</b></code> options.
  </p>

  <p>The <code><b>--type-naming</b></code> option specifies the
     convention that should be used for naming C++ types. Possible
     values for this option are <code><b>knr</b></code> (default),
     <code><b>ucc</b></code>, and <code><b>java</b></code>. The
     <code><b>knr</b></code> value (stands for K&amp;R) signifies
     the standard, lower-case naming convention with the underscore
     used as a word delimiter, for example: <code>foo</code>,
     <code>foo_bar</code>. The <code><b>ucc</b></code> (stands
     for upper-camel-case) and
     <code><b>java</b></code> values a synonyms for the same
     naming convention where the first letter of each word in the
     name is capitalized, for example: <code>Foo</code>,
     <code>FooBar</code>.</p>

  <p>Similarly, the <code><b>--function-naming</b></code> option
     specifies the convention that should be used for naming C++
     functions. Possible values for this option are <code><b>knr</b></code>
     (default), <code><b>lcc</b></code>, and <code><b>java</b></code>. The
     <code><b>knr</b></code> value (stands for K&amp;R) signifies
     the standard, lower-case naming convention with the underscore
     used as a word delimiter, for example: <code>foo()</code>,
     <code>foo_bar()</code>. The <code><b>lcc</b></code> value
     (stands for lower-camel-case) signifies a naming convention
     where the first letter of each word except the first is
     capitalized, for example: <code>foo()</code>, <code>fooBar()</code>.
     The <code><b>java</b></code> naming convention is similar to
     the lower-camel-case one except that accessor functions are prefixed
     with <code>get</code>, modifier functions are prefixed
     with <code>set</code>, parsing functions are prefixed
     with <code>parse</code>, and serialization functions are
     prefixed with <code>serialize</code>, for example:
     <code>getFoo()</code>, <code>setFooBar()</code>,
     <code>parseRoot()</code>, <code>serializeRoot()</code>.</p>

  <p>Note that the naming conventions specified with the
     <code><b>--type-naming</b></code> and
     <code><b>--function-naming</b></code> options perform only limited
     transformations on the names that come from the schema in the
     form of type, attribute, and element names. In other words, to
     get consistent results, your schemas should follow a similar
     naming convention as the one you would like to have in the
     generated code. Alternatively, you can use the
     <code><b>--*-regex</b></code> options (discussed below)
     to perform further transformations on the names that come from
     the schema.</p>

  <p>The
     <code><b>--type-regex</b></code>,
     <code><b>--accessor-regex</b></code>,
     <code><b>--one-accessor-regex</b></code>,
     <code><b>--opt-accessor-regex</b></code>,
     <code><b>--seq-accessor-regex</b></code>,
     <code><b>--modifier-regex</b></code>,
     <code><b>--one-modifier-regex</b></code>,
     <code><b>--opt-modifier-regex</b></code>,
     <code><b>--seq-modifier-regex</b></code>,
     <code><b>--parser-regex</b></code>,
     <code><b>--serializer-regex</b></code>,
     <code><b>--const-regex</b></code>,
     <code><b>--enumerator-regex</b></code>, and
     <code><b>--element-type-regex</b></code> options allow you to
     specify extra regular expressions for each name category in
     addition to the predefined set that is added depending on
     the <code><b>--type-naming</b></code> and
     <code><b>--function-naming</b></code> options. Expressions
     that are provided with the <code><b>--*-regex</b></code>
     options are evaluated prior to any predefined expressions.
     This allows you to selectively override some or all of the
     predefined transformations. When debugging your own expressions,
     it is often useful to see which expressions match which names.
     The <code><b>--name-regex-trace</b></code> option allows you
     to trace the process of applying regular expressions to
     names.</p>

  <p>The value for the <code><b>--*-regex</b></code> options should be
     a perl-like regular expression in the form
     <code><b>/</b><i>pattern</i><b>/</b><i>replacement</i><b>/</b></code>.
     Any character can be used as a delimiter instead of <code><b>/</b></code>.
     Escaping of the delimiter character in <code><i>pattern</i></code> or
     <code><i>replacement</i></code> is not supported.
     All the regular expressions for each category are pushed into a
     category-specific stack with the last specified expression
     considered first. The first match that succeeds is used. For the
     <code><b>--one-accessor-regex</b></code> (accessors with cardinality one),
     <code><b>--opt-accessor-regex</b></code> (accessors with cardinality optional), and
     <code><b>--seq-accessor-regex</b></code> (accessors with cardinality sequence)
     categories the  <code><b>--accessor-regex</b></code> expressions are
     used as a fallback. For the
     <code><b>--one-modifier-regex</b></code>,
     <code><b>--opt-modifier-regex</b></code>, and
     <code><b>--seq-modifier-regex</b></code>
     categories the  <code><b>--modifier-regex</b></code> expressions are
     used as a fallback. For the <code><b>--element-type-regex</b></code>
     category the <code><b>--type-regex</b></code> expressions are
     used as a fallback.</p>

  <p>The type name expressions (<code><b>--type-regex</b></code>)
     are evaluated on the name string that has the following
     format:</p>

  <p><code>[<i>namespace</i> ]<i>name</i>[,<i>name</i>][,<i>name</i>][,<i>name</i>]</code></p>

  <p>The element type name expressions
     (<code><b>--element-type-regex</b></code>), effective only when
     the <code><b>--generate-element-type</b></code> option is specified,
     are evaluated on the name string that has the following
     format:</p>

  <p><code><i>namespace</i> <i>name</i></code></p>

  <p>In the type name format the <code><i>namespace</i></code> part
     followed by a space is only present for global type names. For
     global types and elements defined in schemas without a target
     namespace, the <code><i>namespace</i></code> part is empty but
     the space is still present. In the type name format after the
     initial <code><i>name</i></code> component, up to three additional
     <code><i>name</i></code> components can be present, separated
     by commas. For example:</p>

  <p><code><b>http://example.com/hello type</b></code></p>
  <p><code><b>foo</b></code></p>
  <p><code><b>foo,iterator</b></code></p>
  <p><code><b>foo,const,iterator</b></code></p>

  <p>The following set of predefined regular expressions is used to
     transform type names when the upper-camel-case naming convention
     is selected:</p>

  <p><code><b>/(?:[^ ]* )?([^,]+)/\u$1/</b></code></p>
  <p><code><b>/(?:[^ ]* )?([^,]+),([^,]+)/\u$1\u$2/</b></code></p>
  <p><code><b>/(?:[^ ]* )?([^,]+),([^,]+),([^,]+)/\u$1\u$2\u$3/</b></code></p>
  <p><code><b>/(?:[^ ]* )?([^,]+),([^,]+),([^,]+),([^,]+)/\u$1\u$2\u$3\u$4/</b></code></p>

  <p>The accessor and modifier expressions
     (<code><b>--*accessor-regex</b></code> and
     <code><b>--*modifier-regex</b></code>) are evaluated on the name string
     that has the following format:</p>

  <p><code><i>name</i>[,<i>name</i>][,<i>name</i>]</code></p>

  <p>After the initial <code><i>name</i></code> component, up to two
     additional <code><i>name</i></code> components can be present,
     separated by commas. For example:</p>

  <p><code><b>foo</b></code></p>
  <p><code><b>dom,document</b></code></p>
  <p><code><b>foo,default,value</b></code></p>

  <p>The following set of predefined regular expressions is used to
     transform accessor names when the <code><b>java</b></code> naming
     convention is selected:</p>

  <p><code><b>/([^,]+)/get\u$1/</b></code></p>
  <p><code><b>/([^,]+),([^,]+)/get\u$1\u$2/</b></code></p>
  <p><code><b>/([^,]+),([^,]+),([^,]+)/get\u$1\u$2\u$3/</b></code></p>

  <p>For the parser, serializer, and enumerator categories, the
     corresponding regular expressions are evaluated on local names of
     elements and on enumeration values, respectively. For example, the
     following predefined regular expression is used to transform parsing
     function names when the <code><b>java</b></code> naming convention
     is selected:</p>

  <p><code><b>/(.+)/parse\u$1/</b></code></p>

  <p>The const category is used to create C++ constant names for the
     element/wildcard/text content ids in ordered types.</p>

  <p>See also the REGEX AND SHELL QUOTING section below.</p>

  <h1>TYPE MAP</h1>

  <p>Type map files are used in C++/Parser to define a mapping between
     XML Schema and C++ types. The compiler uses this information
     to determine the return types of <code><b>post_*</b></code>
     functions in parser skeletons corresponding to XML Schema
     types as well as argument types for callbacks corresponding
     to elements and attributes of these types.</p>

  <p>The compiler has a set of predefined mapping rules that map
     built-in XML Schema types to suitable C++ types (discussed
     below) and all other types to <code><b>void</b></code>.
     By providing your own type maps you can override these predefined
     rules. The format of the type map file is presented below:
  </p>

  <pre>
namespace &lt;schema-namespace> [&lt;cxx-namespace>]
{
  (include &lt;file-name>;)*
  ([type] &lt;schema-type> &lt;cxx-ret-type> [&lt;cxx-arg-type>];)*
}
  </pre>

  <p>Both <code><i>&lt;schema-namespace></i></code> and
     <code><i>&lt;schema-type></i></code> are regex patterns while
     <code><i>&lt;cxx-namespace></i></code>,
     <code><i>&lt;cxx-ret-type></i></code>, and
     <code><i>&lt;cxx-arg-type></i></code> are regex pattern
     substitutions. All names can be optionally enclosed in
     <code><b>" "</b></code>, for example, to include white-spaces.</p>

  <p><code><i>&lt;schema-namespace></i></code> determines XML
     Schema namespace. Optional <code><i>&lt;cxx-namespace></i></code>
     is prefixed to every C++ type name in this namespace declaration.
     <code><i>&lt;cxx-ret-type></i></code> is a C++ type name that is
     used as a return type for the <code><b>post_*</b></code> functions.
     Optional <code><i>&lt;cxx-arg-type></i></code> is an argument
     type for callback functions corresponding to elements and attributes
     of this type. If
     <code><i>&lt;cxx-arg-type></i></code> is not specified, it defaults
     to <code><i>&lt;cxx-ret-type></i></code> if <code><i>&lt;cxx-ret-type></i></code>
     ends with <code><b>*</b></code> or <code><b>&amp;</b></code> (that is,
     it is a pointer or a reference) and
     <code><b>const</b>&nbsp;<i>&lt;cxx-ret-type></i><b>&amp;</b></code>
     otherwise.
     <code><i>&lt;file-name></i></code> is a file name either in the
     <code><b>" "</b></code> or <code><b>&lt; ></b></code> format
     and is added with the <code><b>#include</b></code> directive to
     the generated code.</p>

  <p>The <code><b>#</b></code> character starts a comment that ends
     with a new line or end of file. To specify a name that contains
     <code><b>#</b></code> enclose it in <code><b>" "</b></code>.
     For example:</p>

  <pre>
namespace http://www.example.com/xmlns/my my
{
  include "my.hxx";

  # Pass apples by value.
  #
  apple apple;

  # Pass oranges as pointers.
  #
  orange orange_t*;
}
  </pre>

  <p>In the example above, for the
     <code><b>http://www.example.com/xmlns/my#orange</b></code>
     XML Schema type, the <code><b>my::orange_t*</b></code> C++ type will
     be used as both return and argument types.</p>

  <p>Several namespace declarations can be specified in a single
     file. The namespace declaration can also be completely
     omitted to map types in a schema without a namespace. For
     instance:</p>

  <pre>
include "my.hxx";
apple apple;

namespace http://www.example.com/xmlns/my
{
  orange "const orange_t*";
}
  </pre>

  <p>The compiler has a number of predefined mapping rules that can be
     presented as the following map files. The string-based XML Schema
     built-in types are mapped to either <code><b>std::string</b></code>
     or <code><b>std::wstring</b></code> depending on the character type
     selected with the <code><b>--char-type</b></code> option
     (<code><b>char</b></code> by default).</p>

  <pre>
namespace http://www.w3.org/2001/XMLSchema
{
  boolean bool bool;

  byte "signed char" "signed char";
  unsignedByte "unsigned char" "unsigned char";

  short short short;
  unsignedShort "unsigned short" "unsigned short";

  int int int;
  unsignedInt "unsigned int" "unsigned int";

  long "long long" "long long";
  unsignedLong "unsigned long long" "unsigned long long";

  integer "long long" "long long";

  negativeInteger "long long" "long long";
  nonPositiveInteger "long long" "long long";

  positiveInteger "unsigned long long" "unsigned long long";
  nonNegativeInteger "unsigned long long" "unsigned long long";

  float float float;
  double double double;
  decimal double double;

  string std::string;
  normalizedString std::string;
  token std::string;
  Name std::string;
  NMTOKEN std::string;
  NCName std::string;
  ID std::string;
  IDREF std::string;
  language std::string;
  anyURI std::string;

  NMTOKENS xml_schema::string_sequence;
  IDREFS xml_schema::string_sequence;

  QName xml_schema::qname;

  base64Binary std::auto_ptr&lt;xml_schema::buffer>
               std::auto_ptr&lt;xml_schema::buffer>;
  hexBinary std::auto_ptr&lt;xml_schema::buffer>
            std::auto_ptr&lt;xml_schema::buffer>;

  date xml_schema::date;
  dateTime xml_schema::date_time;
  duration xml_schema::duration;
  gDay xml_schema::gday;
  gMonth xml_schema::gmonth;
  gMonthDay xml_schema::gmonth_day;
  gYear xml_schema::gyear;
  gYearMonth xml_schema::gyear_month;
  time xml_schema::time;
}
  </pre>

  <p>The last predefined rule maps anything that wasn't mapped by
     previous rules to <code><b>void</b></code>:</p>

  <pre>
namespace .*
{
  .* void void;
}
  </pre>


  <p>When you provide your own type maps with the
     <code><b>--type-map</b></code> option, they are evaluated first.
     This allows you to selectively override predefined rules.</p>

  <h1>REGEX AND SHELL QUOTING</h1>

  <p>When entering a regular expression argument in the shell
     command line it is often necessary to use quoting (enclosing
     the argument in <code><b>"&nbsp;"</b></code> or
     <code><b>'&nbsp;'</b></code>) in order to prevent the shell
     from interpreting certain characters, for example, spaces as
     argument separators and <code><b>$</b></code> as variable
     expansions.</p>

  <p>Unfortunately it is hard to achieve this in a manner that is
     portable across POSIX shells, such as those found on
     GNU/Linux and UNIX, and Windows shell. For example, if you
     use <code><b>"&nbsp;"</b></code> for quoting you will get a
     wrong result with POSIX shells if your expression contains
     <code><b>$</b></code>. The standard way of dealing with this
     on POSIX systems is to use <code><b>'&nbsp;'</b></code> instead.
     Unfortunately, Windows shell does not remove <code><b>'&nbsp;'</b></code>
     from arguments when they are passed to applications. As a result you
     may have to use <code><b>'&nbsp;'</b></code> for POSIX and
     <code><b>"&nbsp;"</b></code> for Windows (<code><b>$</b></code> is
     not treated as a special character on Windows).</p>

  <p>Alternatively, you can save regular expression options into
     a file, one option per line, and use this file with the
     <code><b>--options-file</b></code> option. With this approach
     you don't need to worry about shell quoting.</p>

  <h1>DIAGNOSTICS</h1>

  <p>If the input file is not a valid W3C XML Schema definition,
    <code><b>xsd</b></code> will issue diagnostic messages to STDERR
    and exit with non-zero exit code.</p>

  <h1>BUGS</h1>

  <p>Send bug reports to the
     <a href="mailto:xsd-users@codesynthesis.com">xsd-users@codesynthesis.com</a> mailing list.</p>

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