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authorJörg Frings-Fürst <debian@jff-webhosting.net>2014-07-23 15:25:44 +0200
committerJörg Frings-Fürst <debian@jff-webhosting.net>2014-07-23 15:25:44 +0200
commit8286ac511144e4f17d34eac9affb97e50646344a (patch)
treef1af7320d7b6be6be059216d0ad08ac7b4f73fd0 /xsd/documentation/schema-authoring-guide.xhtml
parenta15cf65c44d5c224169c32ef5495b68c758134b7 (diff)
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-<?xml version="1.0" encoding="iso-8859-1"?>
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
-
-<head>
- <title>XML Schema Authoring Guide</title>
-
- <meta name="copyright" content="&copy; 2005-2010 Code Synthesis Tools CC"/>
- <meta name="keywords" content="xsd,xml,schema,c++,mapping,data,binding,authoring,guide"/>
- <meta name="description" content="XML Schema Authoring Guide"/>
-
- <link rel="stylesheet" type="text/css" href="default.css" />
-
-<style type="text/css">
- pre {
- background : #cde8f6;
-
- padding : 0 0 0 1em;
- margin : 2em 0em 2em 0;
-
- font-size : 95%
- }
-
- body {
- min-width: 46em;
- }
-
- ul.toc li {
- padding : .4em 0em 0em 0em;
- list-style : none;
- }
-
-</style>
-
-
-</head>
-
-<body>
-<div id="container">
- <div id="content">
-
- <h1>Table of Contents</h1>
-
- <ul class="toc">
- <li>1. <a href="#intro">Introduction</a></li>
-
- <li>2. <a href="#global_element">Don't define a global element which
- is not a valid document root</a></li>
-
- <li>3. <a href="#same_local">Don't name a type and an element/attribute
- of this type with the same name</a></li>
-
- <li>3. <a href="#integer">Don't use <code>xsd:integer</code> and
- friends</a></li>
-
- <li>4. <a href="#int">Use <code>xsd:int/xsd:unsignedInt</code> for 32 bit
- integers</a></li>
- </ul>
-
- <h1><a name="intro">Introduction</a></h1>
-
- <p>Making it possible to cleanly map W3C XML Schema to programming languages
- was never a goal of the XML Schema Working Group. As a result there
- is a number of Schema constructs, techniques, and styles that don't
- have appropriate counterparts in C++. This document presents a list
- of do's and don'ts that will help ensure your schemas, when translated
- by XSD, result in C++ code that is enjoyable to work with.</p>
-
-
- <h1><a name="global_element">Don't define a global element which is not
- a valid document root</a></h1>
-
- <p>Instead of</p>
-
- <pre>
-&lt;xsd:element name="author" type="Author"/>
-
-&lt;xsd:complexType name="Book">
- &lt;xsd:sequence>
- &lt;xsd:element ref="author"/>
- &lt;/xsd:sequence>
-&lt;/xsd:complexType>
- </pre>
-
- <p>Write</p>
-
- <pre>
-&lt;xsd:complexType name="Book">
- &lt;xsd:sequence>
- &lt;xsd:element name="author" type="Author"/>
- &lt;/xsd:sequence>
-&lt;/xsd:complexType>
- </pre>
-
- <p>Any globally-defined element is a potential document root. For every
- such element XSD generates a set of overloaded parsing
- functions. If you cannot change your schema, consider using the
- <code>--root-element-*</code> options to specify which global
- element(s) are actual document root(s).</p>
-
-
-
- <h1><a name="same_local">Don't name a type and an element/attribute of
- this type with the same name</a></h1>
-
- <p>Instead of</p>
-
- <pre>
-&lt;xsd:complexType name="name">
- &lt;xsd:sequence>
- &lt;xsd:element name="name" type="xsd:string"/>
- &lt;/xsd:sequence>
- &lt;xsd:attribute name="lang" type="xsd:language"/>
-&lt;/xsd:complexType>
- </pre>
-
- <p>Write</p>
-
- <pre>
-&lt;xsd:complexType name="Name">
- &lt;xsd:sequence>
- &lt;xsd:element name="name" type="xsd:string"/>
- &lt;/xsd:sequence>
- &lt;xsd:attribute name="lang" type="xsd:language"/>
-&lt;/xsd:complexType>
- </pre>
-
- <p>Use of a class name as a member function name within this class is
- illegal in C++. XSD will resolve such conflicts by renaming
- the conflicting member function. In the example above, you will end
- up with the following generated code:</p>
-
- <pre>
- class name
- {
- public:
- string
- name1 () const;
-
- language
- lang () const;
-
- ...
-
- };
- </pre>
-
- <h1><a name="integer">Don't use <code>xsd:integer</code> and
- friends</a></h1>
-
- <p>XML Schema built-in types <code>integer</code>,
- <code>nonPositiveInteger</code>, <code>nonNegativeInteger</code>,
- <code>positiveInteger</code>, and <code>negativeInteger</code>
- are arbitrary-length integral types. XSD maps them to the
- <code>long long</code> and <code>unsigned long long</code> C++
- types. In most cases you would prefer to use either
- <code>xsd:int/xsd:unsignedInt</code> (32 bit, maps to C++
- <code>int/unsigned int</code>) or
- <code>xsd:long/xsd:unsignedLong</code> (64 bit, maps to C++
- <code>long long/unsigned long long</code>).
- </p>
-
- <h1><a name="int">Use <code>xsd:int/xsd:unsignedInt</code> for 32 bit
- integers</a></h1>
-
- <p>XML Schema built-in types <code>long</code> and
- <code>unsignedLong</code> are 64 bit wide so use 32 bit <code>int</code>
- and <code>unsignedInt</code> unless you meant 64 bit.</p>
-
- </div>
- <div id="footer">
- &copy;2005-2010 <a href="http://codesynthesis.com">CODE SYNTHESIS TOOLS CC</a>
-
- <div id="terms">
- Permission is granted to copy, distribute and/or modify this
- document under the terms of the
- <a href="http://codesynthesis.com/licenses/fdl-1.2.txt">GNU Free
- Documentation License, version 1.2</a>; with no Invariant Sections,
- no Front-Cover Texts and no Back-Cover Texts.
- </div>
- </div>
-
-</div>
-
-
-</body>
-</html>