xml-test checks that an XML document is included
in another document. It is handy when testing an
application's output against a document where
element order is different (GData and Atom are
examples of specifications where element order is
unimportant). It has a relaxed notion of
containment: element order is ignored, whitespace
is trimmed, comments are ignored, specific
elements can be ignored by passing XPath-like
paths on the command line, and text nodes (element
and attribute content) can be ignored by passing
'-notext' on the command line.
