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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept id="GUID-77ECD89F-84BB-55F1-9876-382E043F0C0D" xml:lang="en"><title>XML

Error Handling Reference</title><shortdesc>This section describes how the different components dealing with

XML manage error conditions. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>In all cases, ensure that your XML is valid and well-formed when using

one of the parsers below. </p>

<p> <b>libxml2 component</b>  </p>

<p>The libxml2 C library has its own error codes and returns <codeph>NULL</codeph> pointers

in Out-Of-Memory conditions. It also stores the last parsing error in a member

of the global <codeph>_xmlGlobalState</codeph> structure. Access this variable

using TLS (Thread-Local Storage). </p>

<p>The methods of the Utilities wrapper leave when they detect an Out-Of-Memory

condition in the libxml2 library. </p>

<p> <b>XML DOM Engine</b>  </p>

<p>When calling a method of the XML DOM Engine, check its return value for

an error code. </p>

<p>Methods that leave do so in Out-Of-Memory conditions. Methods that read

or write files also leave on I/O errors. </p>

<p> <b>XML DOM Engine Serialiser</b>  </p>

<p>The serialiser does not forward all the libxml2 errors and may leave with

the Symbian platform mechanism instead. </p>

<p> <b>XML Framework</b>  </p>

<p>The libxml2 SAX plugin maps the errors received from the libxml2 parser

to parsing events. The leave mechanism only applies when the error is fatal

for the libxml2 parser. </p>

<p>The Expat and WBXML parser plugins use a combination of parsing events

and leaves to handle errors. </p>

</conbody><related-links>

<link href="GUID-33D50AB9-AFA8-521F-8A85-031C24EA7D25.dita"><linktext>libxml2</linktext>

</link>

<link href="GUID-5ACFA8E4-3C4B-5851-A43E-9FA72D0B8403.dita"><linktext>XML DOM Engine</linktext>

</link>

<link href="GUID-F79E4F18-19E2-577E-8409-8B82BD48AC66.dita"><linktext>XML Framework</linktext>

</link>

</related-links></concept>