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<title>Validating an XML schema</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="skipspace"><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, follow these steps:</p>
</div>
<ol><li class="skipspace"><span>Right-click your file in the Navigator view and click <span class="uicontrol">
	<b>Validate
XML Schema</b>.</span></span></li>
<li class="skipspace"><span>You will receive a message indicating whether the XML schema file is
valid.</span>  If validation was not successful, refer to the Problems
view to see what problems were logged.  <div class="note"><span class="notetitle">
	<b>Note</b>: </span>If you receive an error message
indicating that the Problems view is full, you can increase the number of
error messages allowed by selecting  <b>  <span class="menucascade"><span class="uicontrol">Properties &gt;
Validation</span></span></b> from the project's pop-up menu and specifying
the maximum number of error messages allowed.</div>
</li>
</ol>
<div class="skipspace"><p>The XML schema support in the XML schema editor is
based on the W3C XML Schema Recommendation Specification of 2 May 2001. The
XML Schema specifications <a href="http://www.w3.org/TR/xmlschema-1/" target="_blank">XML Schema Part 1: Structures</a> and <a href="http://www.w3.org/TR/xmlschema-2/" target="_blank">XML Schema Part 2: Datatypes</a> 
	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  <a href="http://www.w3.org/TR/xmlschema-1/" target="_blank">XML Schema Part 1: Structures</a> 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.2,</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". The <tt class="sysout">.2</tt> means the 2nd constraint, which
reads: "2. If the {base type definition} is a simple type definition, the
{derivation method} must be extension."</p>
<p>You can set up a project's properties
so that different types of project resources are automatically validated when
you save them. 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><p><b class="reltaskshd">Related tasks</b><br />
<a href="../topics/tcxmlsch.html" title="You can create an XML schema and then edit it using the XML schema editor.">Creating XML schemas</a><br />
</p>
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