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git.eclipse.org / sourceediting / webtools.sourceediting / bd19ea5c631110c54ed0e462286894284a13f1d5 / . / docs / org.eclipse.wst.xmleditor.doc.user / topics / txsityp.html
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kpriceef160682006-08-29 18:08:31 +0000[diff] [blame]1<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
2<html lang="en-us" xml:lang="en-us">
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11<meta name="DC.Title" content="Using xsi:type" />
12<meta name="abstract" content="If you have elements in your XML file whose type is a complex type, xsi:type support in the XML editor lets you choose between the complex type and any other complex types derived from it." />
13<meta name="description" content="If you have elements in your XML file whose type is a complex type, xsi:type support in the XML editor lets you choose between the complex type and any other complex types derived from it." />
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syeshinbefd53e2005-07-27 18:16:40 +0000[diff] [blame]18<title>Using xsi:type</title>
syeshin66078272005-09-20 16:53:38 +0000[diff] [blame]19</head>
syeshinbefd53e2005-07-27 18:16:40 +0000[diff] [blame]20<body id="txsityp"><a name="txsityp"><!-- --></a>
21
kpriceef160682006-08-29 18:08:31 +0000[diff] [blame]22
syeshinbefd53e2005-07-27 18:16:40 +0000[diff] [blame]23<h1 class="topictitle1">Using xsi:type</h1>
kpriceef160682006-08-29 18:08:31 +0000[diff] [blame]24
25
26
syeshinbefd53e2005-07-27 18:16:40 +0000[diff] [blame]27<div><p>If you have elements in your XML file whose type is a complex type,
28xsi:type support in the XML editor lets you choose between the complex type
kpriceef160682006-08-29 18:08:31 +0000[diff] [blame]29and any other complex types derived from it.</p>
30
31<div class="section"><p>The XML Schema specification allows you to derive types by extension.
kpriceb59c9f62008-04-02 21:24:37 +0000[diff] [blame]32See the following steps as an example:</p>
33</div>
34
35<ol>
36<li class="stepexpand"><span>Create an XML schema and create a complex type for it called <kbd class="userinput">Address</kbd>. </span>
37</li>
38
39<li class="stepexpand"><span>Add some basic elements to <kbd class="userinput">Address</kbd>, such
40as <kbd class="userinput">streetName</kbd> and <kbd class="userinput">city</kbd>.</span>
41</li>
42
43<li class="stepexpand"><span>Derive (by extension) two new complex types from <kbd class="userinput">Address</kbd>: <kbd class="userinput">USAddress</kbd> and <kbd class="userinput">UKAddress</kbd>. </span></li>
44
45<li class="stepexpand"><span>Add a new element to <kbd class="userinput">USAddress</kbd> called <kbd class="userinput">state</kbd>,
46and also a new element to <kbd class="userinput">UKAddress</kbd> called <kbd class="userinput">postcode</kbd>.</span>
47</li>
48
49<li class="stepexpand"><span>Create two more elements: <kbd class="userinput">billTo</kbd> and <kbd class="userinput">shipTo</kbd>,
50as <tt class="sysout">Address</tt> types.</span></li>
51
52<li class="stepexpand"><span>When you create an XML instance document for an element such as
53 <tt class="sysout">billTo</tt> or <kbd class="userinput">Address</kbd>, an
54xsi:type attribute will automatically be added to it.</span> For example, <pre>&lt;billTo xsi:type="ipo:Address"&gt;</pre>
55The
syeshinbefd53e2005-07-27 18:16:40 +0000[diff] [blame]56xsi:type attribute is used to identify derived complex types (as well as complex
kpriceb59c9f62008-04-02 21:24:37 +0000[diff] [blame]57types that have been derived from).</li>
58
59<li class="stepexpand"><span>In the Design view of the XML editor, a list will be available,
60letting you select the appropriate type definition (<span class="uicontrol">Address</span>, <span class="uicontrol">USAddress</span>,
61or <span class="uicontrol">UKAddress</span>). The guided editing for the content
62model will reflect the type definition that you choose. For example, if you
63select <span class="uicontrol">USAddress</span> , your <samp class="codeph">billTo</samp> element
64can contain a <samp class="codeph">state</samp> element, but it cannot contain a <samp class="codeph">postcode</samp> element.</span>
65</li>
66
67</ol>
68
69<div class="section"><p>The XML example "Editing and validating XML files" demonstrates <strong>xsi:type</strong> support.</p>
syeshinbefd53e2005-07-27 18:16:40 +0000[diff] [blame]70<p>For
kpriceef160682006-08-29 18:08:31 +0000[diff] [blame]71more information about xsi:type, refer to the <strong>Using Derived Types in Instance
72Documents</strong> section in <a href="http://www.w3.org/TR/xmlschema-0/#UseDerivInInstDocs" target="_blank">XML Schema Part 0: Primer.</a></p>
73<p>For more information
74about validation semantics when xsi:type is used, refer to the <strong>Schema-Related
75Markup in Documents Being Validated</strong> section in <a href="http://www.w3.org/TR/xmlschema-1/#xsi_type" target="_blank">XML Schema Part 1: Structures</a> </p>
syeshinbefd53e2005-07-27 18:16:40 +0000[diff] [blame]76</div>
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syeshinbefd53e2005-07-27 18:16:40 +0000[diff] [blame]78</div>
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80
syeshinbefd53e2005-07-27 18:16:40 +0000[diff] [blame]81</body>
82</html>