does xsl:discard-document work with xsl:result-document?

We're using xsl:result-document to a big input file into many hundreds of
output files.
Memory usage is constantly rising during the "splitting" process, so it
looks as if the
separate result documents remain referenced until the end of the
transformation.

Should this be the case?  Is there anything equivalent to
xsl:discard-document
for result-documents?

Thanks for any pointers

-alan



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