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<h1 class="topictitle1">Identifying parse errors in XPCML</h1>
<div><p>When validating XPCML schema documents, a fully validating XML
parser may generate warnings, non-fatal parse errors, and fatal parse errors.</p>
<div class="section"><p>Warnings and non-fatal parse errors do not cause the parse
to fail. You might want to examine warnings and non-fatal errors to help you
determine problems with your XPCML source. Fatal parse errors cause the parse
to terminate with an exception.</p>
<p>To display warnings and non-fatal parser
errors when parsing an XPCML document, turn tracing on in your application
and set the trace category to PCML.</p>
</div>
<div class="section"><h4 class="sectiontitle">Example</h4><p>A fully validating XML parser generates
an error for any numeric parameter type that does not have a value. The following
example shows sample XPCML source and the resulting non-fatal parse error:</p>
<p><strong>XPCML
source</strong></p>
<pre> &lt;program name="prog1"/&gt;
&lt;parameterList&gt;
&lt;intParm name="parm1"/&gt;
&lt;/parameterList&gt;
&lt;/program&gt;</pre>
<p><strong>Resulting error</strong></p>
<pre> Tue Mar 25 15:21:44 CST 2003 [Error]: cvc-complex-type.2.2: Element
'intParm' must have no element [children], and the value must be valid.</pre>
<p>To
prevent logging this kind of error, add the nil=true attribute to the intParm
element. The nil=true atttribute signals to the parser that you have deliberately
left the element empty.. Here is the previous XPCML source with the nil=true
atttribute added:</p>
<pre> &lt;program name="prog1"/&gt;
&lt;parameterList&gt;
&lt;intParm xsi:nil="true" name="parm1"/&gt;
&lt;/parameterList&gt;
&lt;/program&gt;</pre>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzahhxpcmlusing.htm" title="Using XPCML is similar to using PCML. The following steps serve as a general outline for the actions that you need to perform to use XPCML.">Using XPCML</a></div>
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