XSLT - base URL for relative file paths - from Stylesh

I am processing several XML files in different locations linked by an index
XML file that contains the relative paths to each XML file.
I am also using stylesheets in several different directories.

When using different XSLT processors there seems to be at least two
different conventions being used for WHICH of the stylesheet or the document
(or maybe even the calling location?) determines the base URL for relative
files paths.

Is this specified unambiguously in the W3C standard (I thought it was) or is
it unspecified / open to different interpretations by different XSLT
implementers?

E.g. XALAN, XSLTPROC, SAXON behave differently from SABLOTRON.
(And I have had problems with MSXML in the past though not tried it
recently.)





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