XML::Pastor: "Dealing with XML in Perl via code generation from XSD"

XML::Compile: "Where other Perl modules (like SOAP::WSDL) help you using these schemas (often with a lot of run-time XPath searches), XML::Compile takes a different approach: instead of run-time processing of the specification, it will first compile the expected structure into a pure Perl CODE reference, and then use that to process the data as often as needed."

Looks to me like there are some similarities. While XML::Pastor seems to generate a set of classes that you can then use to build up or modify the XML, XML::Compile just generates some code that transforms between XML and Perl datastructure. I think both make a lot of sense. And both are good tools to keep in the toolbox. I don't think it's wise to restrict oneself to just one XML processing module.