I often write little test XSLT programs that read themselves as their input.
Usually I do this by putting the data into an element from the
http://www.wwp.neu.edu/temp/ns namespace or, if I am using oXygen, from the
http://www.oxygenxml.com/ns/doc/xsl namespace, which is a child of the
outermost <xsl:stylesheet> element.
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