Added some tests that illustrate the problem
Don't process text nodes consisting of only whitespace
Don't parse children for rdf:parseType="Resource"

defaultA calls parseObjectsFromChildren to parse child elements, which
in turn is oblivious to the meaning of rdf:parseType="Resource" and
parses child elements, consequently failing test_parseXmlRDF_example12.
Remove "rdf:Description" constraint for child elts
Merge pull request #6 from maertsen/fix_xmlparser-child-elt-as-resource

XmlParser does not implicitly connect a child of a resource-less element, produces literal for newline instead