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<h1>XForms Data Types</h1>
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<p class="intro">The XForms model supports XML Schema data types.</p>
<hr />
<h2>XML Schema Data Types</h2>
<p>The XForms model supports XML Schema data types. This feature allows the
XForms processor to check the data for correct input values.</p>
<p>You can learn more about XML Schema in our <a href="../schema/default.asp">XML
Schema tutorial</a>.</p>
<p>To use XML Schema data types, you must add the XML Schema namespaces to your
namespace declaration like this:</p>
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<pre><html
xmlns:xf="http://www.w3.org/2002/xforms"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"></pre>
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<p>After adding the XML Schema namespaces, you can add type attributes to your
XForms instance elements like this:</p>
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<tr>
<td>
<pre><xf:instance>
<person xmlns="">
<fname xsi:type="xsd:string"/>
<lname xsi:type="xsd:string"/>
<born xsi:type="xsd:date"/>
<size xsi:type="xsd:integer"/>
</person>
</xf:instance></pre>
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<p>XForms supports all XML Schema data types except for the following:</p>
<ul type="square">
<li>duration</li>
<li>ENTITY</li>
<li>ENTITIES</li>
<li>NOTATION</li>
</ul>
<p>For a complete reference to XForms data types:</p>
<p><a href="xforms_typeref.asp">Complete XForms Data Type Reference</a></p>
<p><a target="_blank" href="tryit_xapp.asp@filename=try_type">Try it yourself</a>
</p>
<hr />
<h2>Binding Datatypes</h2>
<p>In XForms you can also use the <bind> element to associate data types with
instance data: </p>
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<pre><xf:bind nodeset="/person/size" type="xsd:integer"/></pre>
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