| This is an XML prettyprinter. It takes a string that is in XML format
and converts it into a multi-line, indented structure
that is easier for the user to read.
Prior to calling this method, nothing in Squirrel is "XML-aware",
so we do not prevent the user from calling this method if the
data is not an XML string.
However, we do warn the user if the data is not XML or is improperly formatted.
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