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<title>Validating XML schemas</title>
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<h1 class="topictitle1">Validating XML schemas</h1>
<div><p>Validating an XML schema determines whether the current state of
the XML schema file is semantically valid. Any errors will be displayed in
the Problems view.</p>
<div class="section"><p>The following instructions were written for the Resource perspective,
but they will also work in many other perspectives.</p>
<p>To validate an XML
schema, complete the following steps:</p>
</div>
<ol>
<li class="stepexpand"><span>Right-click your file in the Navigator view and click <span class="uicontrol">Validate</span>.</span>
</li>
<li class="stepexpand"><span> If validation was not successful, you can refer to the Problems
view to see what problems were logged. </span> <div class="note"><span class="notetitle">Note:</span> If you receive
an error message indicating that the Problems view is full, you can increase
the number of error messages allowed by clicking <span class="menucascade"><span class="uicontrol">Window</span>
&gt; <span class="uicontrol">Preferences</span></span> and selecting <span class="menucascade">
<span class="uicontrol">General</span> &gt; <span class="uicontrol">Markers</span></span>.
Select the <span class="uicontrol">Use marker limits</span> check box and change the
number in the <span class="uicontrol">Limit visible items per group</span> field.</div>
</li>
</ol>
<div class="section"><p>The XML schema support in the XML schema editor is based on the
W3C XML Schema Recommendation Specification. The XML Schema specifications
XML Schema Part 1: Structures and XML Schema Part 2: Datatypes from the W3C
Web site are used for validation.</p>
<p>Certain error messages contain a reference
to the schema constraints listed in Appendix C of the XML Schema Part 1: Structures
document. Each constraint has a unique name that will be referenced in the
error message. For example, if you receive an error message with this text: <tt class="sysout">ct-props-correct</tt> and
you searched in the Structure document for the text, you would find that it
is for the section "Schema Component Constraint: Complex Type Definition Properties
Correct". </p>
<p>You can set up a project's properties so that different types
of project resources are automatically validated when you save them (this
is set for all resources by default). From a project's pop-up
menu select <span class="uicontrol">Properties</span>, then select <span class="uicontrol">Validation</span>.
Any validators you can run against your project will be listed in the Validation
page.</p>
</div>
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<div><div class="reltasks"><strong>Related tasks</strong><br />
<div><a href="../topics/tcxmlsch.html" title="You can create an XML schema and then edit it using the XML schema editor. Using the XML schema editor, you can specify element names that indicates which elements are allowed in an XML file, and in which combinations.">Creating XML schemas</a></div>
</div>
<div class="relinfo"><strong>Related information</strong><br />
<div><a href="../../org.eclipse.jst.j2ee.doc.user/topics/tjval.html" title="General validation information">../../org.eclipse.jst.j2ee.doc.user/topics/tjval.html</a></div>
<div><a href="http://www.w3.org/TR/xmlschema-1" target="_blank" title="See the W3C Web site for more information on XML Schema specifications">XML
Schema Part 1: Structures</a></div>
<div><a href="http://www.w3.org/TR/xmlschema-2" target="_blank" title="See the W3C Web site for more information on XML Schema specifications">XML
Schema Part 2: Datatypes</a></div>
</div>
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