Michael Kay wrote:
Firstly, if only the element name varies, then you don't need xx:evaluate(),
you can use group-by="*[name()=$param]".
Secondly, if you tried something and it didn't work, then we need to know
exactly what you tried and exactly how it failed.
Ok, so here's the whole relevant xsl snippet
01: <ul>
02: <xsl:for-each-group select="bibtex:entry"
group-by="tokenize(normalize-space(*/bibtex:refgroup),' *; *')">
03: <xsl:sort select="current-grouping-key()" order="ascending"/>
04: <li><xsl:value-of select="current-grouping-key()"/></li>
05: </xsl:for-each-group>
06: </ul>
Each bibtex:refgroup node contains one or more entries separated by ';'.
The entries may contain newlines that do not mark a logical separation,
which is why I put the 'normalize-space'. As stated the above xsl works
as expected by producing a list of refgroups.
Now, to my attempts to dynamically replayce bibtex:refgroup with another
node:
I put
<xsl:param name="groupby">bibtex:refgroup</xsl:param>
immediately after the xsl:output tag (as an immediate child of
xsl:transform).
And added another line
07: <xsl:value-of select="$groupby"/>
A:
Now, I first replaced line 2 above with:
02: <xsl:for-each-group select="bibtex:entry"
group-by="tokenize(normalize-space(*[name()=$groupby]),' *; *')">
The stylesheet compiles alright, but the result of the transformation is:
Result:
<ul></ul>
bibtex:refgroup
B:
line 2 is simplified to
02: <xsl:for-each-group select="bibtex:entry"
group-by="*[name()=$groupby]">
Result: same as (A)
C:
(with saxon:evaluate)
I added
xmlns:saxon="http://saxon.sf.net/"; exclude-result-prefixes="bibtex
fn saxon"
to my xsl:transform tag, and changed line 2 above to
02: <xsl:for-each-group select="bibtex:entry"
group-by="tokenize(normalize-space(saxon:evaluate('*/$groupby')),' *; *')">
Result:
Compilation of the stylesheet fails with:
Error at xsl:for-each-group on line xx[=02] of file:transform.xsl:
Static error in XPath expression supplied to saxon:evaluate:
Undeclared variable in a standalone expression
D:
Changed line 2 to
02: <xsl:for-each-group select="bibtex:entry"
group-by="tokenize(normalize-space(saxon:evaluate('*/$p1', $groupby)),'
*; *')">
Result:
<ul>
<li>bibtex:refgroup</li>
</ul>
bibtex:refgroup
E:
Changed line 2 to
02: <xsl:for-each-group select="bibtex:entry"
group-by="saxon:evaluate('*/$p1', $groupby)">
Result: same as (D)
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