PROPOSAL: default behavior if no source document

The emergence of the document() function in XSLT makes it possible for a
stylesheet to reference all the source trees that it needs. Thus, a
stylesheet may choose to ignore the "primary" source tree. XSL processors,
however, are currently designed with the assumption that the stylesheet must
be associated with a primary source tree.

Would it be within the scope of either the XML-Stylesheet Recommendation,
the XSL or XSLT recommendations to state that when no source tree or source
XML document is associated with the stylesheet, the XSL processor [may,
should or must] use a "empty" source tree? And would such a tree consist of
only a root node?


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