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<?xml version="1.0" encoding="UTF-8"?>
<catalog>
<!--An XML Catalog-->
<?target instruction?>
<journal title="XML Zone"
publisher="IBM developerWorks">
<article level="Intermediate" date="December-2001">
<title>Java configuration with XML Schema</title>
<author>
<firstname>Marcello</firstname>
<lastname>Vitaletti</lastname>
</author>
</article>
</journal>
</catalog>
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<catalog>
<!--An XML catalog-->
<?target instruction?>
<journal title="XML Zone"
publisher="IBM developerWorks">
<article level="Introductory" date="October-2002">
<title>Create flexible and extensible XML schemas</title>
<author>
<firstname>Ayesha</firstname>
<lastname>Malik</lastname>
</author>
</article>
</journal>
</catalog>
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http://topic.csdn.net/t/20021102/16/1142056.html
use classes in System.Xml namespace, for example (assume your xml is in string s and it contains an xmlns definition) ......