You may also want to look at Xerces Perl from the The Apache XML Project

Here is what they say on the Xerces Perl home page:
The Xerces Perl project has created a Perl module, Xerces.pm, as the Perl API to the Apache project's Xerces XML parser. It is implemented using the Xerces C++ API, and it provides access to all of the C++ API from Perl. Because it is based on Xerces-C, Xerces.pm provides a validating XML parser that makes it easy to give your application the ability to read and write XML data. A shared library is provided for parsing, generating, manipulating, and validating XML documents. Xerces.pm is faithful to the XML 1.0 recommendation and associated standards ( DOM 1.0, DOM 2.0. SAX 1.0, SAX 2.0, Namespaces), The parser provides high performance, modularity, and scalability. Source code, samples and API documentation are provided with the parser.

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