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Benchmarks XML parsing speed between XML::Simple with XML::Parser as backend,
SOAP::Lite, SOAP::WSDL outputting objects, SOAP::WSDL outputting hash refs,
XML::LibXML with a simple DOM walker outputting hash refs, XML::LibXML
outputting the DOM and SOAP::WSDL_XS.

No web server required.

This benchmark sheds light on how much performance is - in theory - reachable
by each approach: The XML::LibXML (Hash) benchmark converts the DOM into
a nested hash using a recursive function. This is - basically - how
XML::Compile works. XML::Simple uses XML::Parser's streaming
API. SOAP::WSDL uses XML::Parser::Expat, XML::Parser's low-level backend,
to create objects or - in the (Hash) variant - nested hashes similar to
those created by XML::Simple.
SOAP::WSDL_XS uses a libexpat-based XS parser to create perl objects, and
XML::LibXML (DOM) creates a C level libxml2 DOM accessible from perl.

person.pl:
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Sends a empty requests and receives a response of ca. 10kB.
Modeled after a common enterprise setup: "Give me a list of person data sets".