This was a bug fixed long ago. The key() function should only return matches
from the same source document as the context node.
> <xsl:for-each select="str:split(@ref,' ')">
> <xsl:for-each select="key('point',.)">
> (...)
> </xsl:for-each>
> </xsl:for-each>
str:split creates a new document (xslt rvt) so the key() function will not find
any matches from your original. Run xsltproc --verbose and see the messages
about context document changing. This is per the spec. There are workarounds
for accomplishing this, do a google search, but libxslt is doing the correct
thing.
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