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Actually read in the XML request and stick it in the request object. We do this using the DOM
parser (because the SLD parser is DOM based and we can integrate). 1. parse into DOM 2. parse
the SLD 3. grab the rest of the attribute 4. stuff #3 attributes in the request object 5.
stuff the SLD info into the request object 6. return GetMap schema is at
http://www.opengeospatial.org/docs/02-017r1.pdf (page 18) NOTE: see handlePostGet() for
people who put the SLD in the POST and the parameters in the GET.