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<h1>XForms Properties</h1>
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<p class="intro">XForms properties define data restrictions, types and
behaviors.</p>
<hr />
<h2>XForms Properties</h2>
<p>XForms uses properties to define restrictions (or other
attributes) that can affect the behavior of XForms controls.</p>
<p>Examples:</p>
<p>A <b>required="true()"</b> property will not allow the specified instance
data to be submitted as an empty value.</p>
<p>A <b>type="decimal"</b> property will only allow a decimal value to be
submitted. </p>
<p>A <b>calculate</b> property can calculate a value for the instance data. </p>
<p>Please refer to the properties reference at the bottom of this page.</p>
<hr />
<h2>Binding Properties To Data</h2>
<p>XForms uses the <bind> element to bind XForms properties to XForms data: </p>
<table class="ex" width="100%" cellpadding="2" cellspacing="0" border="1">
<tr>
<td>
<pre><model>
<instance>
<person>
<b><fname/></b>
<b><lname/></b>
</person>
</instance>
<bind <b>nodeset="person/lname"</b> required="true()"/>
</model></pre>
</td>
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<p>In the example above, the attribute nodeset="person/lname" binds the property
required="true()" to the instance data element <lname>.</p>
<hr />
<h2>XForms Properties Reference</h2>
<table class="ex" cellspacing="0" width="100%" border="1">
<tr>
<th valign="top" align="left" width="20%">Name</th>
<th valign="top" align="left" width="80%">Description</th>
</tr>
<tr>
<td valign="top">calculate</td>
<td valign="top">Defines a calculation to be performed on the item</td>
</tr>
<tr>
<td valign="top">constraint</td>
<td valign="top">Defines a constraint for the item</td>
</tr>
<tr>
<td valign="top">p3ptype</td>
<td valign="top">Defines a P3P data type for the item</td>
</tr>
<tr>
<td valign="top">readonly</td>
<td valign="top">Defines an edit restriction for the item (cannot be
changed)</td>
</tr>
<tr>
<td valign="top">relevant</td>
<td valign="top">Defines how relevant the data is (for display or
submission)</td>
</tr>
<tr>
<td valign="top">required</td>
<td valign="top">Defines if data item is required (cannot be blank)</td>
</tr>
<tr>
<td valign="top">type</td>
<td valign="top">Defines the data type for the item</td>
</tr>
</table>
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