XSLT 1 (unlike XSLT2) does not have parentless elements, so it's not
possible to answer the question in the subject line (or at least both "yes"
and "no" are correct answers:-)
It seems to be because the elements copied to "baz-rtf" don't have a
common parent element, they aren't siblings in Xalan...
That would be a bug in xalan then I think. Of course exslt:node-set is
specified by EXSLt ratherthan by the XSLT spec, but it is specified as
returning a standard Xpath 1 node set rather than an obect in a private
data type.
It seems to be because the elements copied to "baz-rtf" don't have a
common parent element,
They should have a common parent.
It's easier to diescus in xslt2 where there are words for this
in xslt2
<xsl:variable name="baz-rtf">
<xsl:copy-of select="//baz"/>
</xsl:variable>
makes a temprary tree with a document node (/) with 4 child nodes (which
doesn't correspond to a well formed document but has always been allowed
in xpath 1 and 2) These nodes are siblings.
<xsl:variable name="baz-rtf" as="element()*>
<xsl:copy-of select="//baz"/>
</xsl:variable>
this makes a sequence of 5 parentless eleemnt nodes, which don't have a
parentt and so are not siblings.
<xsl:variable name="baz-rtf" as="element()*>
<xsl:sequence select="//baz"/>
</xsl:variable>
this makes a sequence of 5 element nodes with parent the <foo> element
in the stylesheet (which is not in the variable) here the elements are
siblings.
David
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