On 08.05.2019 19:18, Michael Kay mike(_at_)saxonica(_dot_)com wrote:
I haven't had a chance to study all of this, but please note that if you want
to use the XPath 3.1 function then you should be using a more recent Saxon
release than 9.3. The current version is 9.9. Also, only the 1-argument version
of sort() will work in Saxon-HE; the more useful versions of the function (that
allow a user-defined sort key) are higher order functions and therefore require
Saxon-PE or Saxon-EE. The syntax would be
<xsl:for-each-group select=“sort(entry[location=$undulator], function($entry)
{data($entry/(isodate,time))})" group-by="statistics_category">
To do it with HE you could implement a sort function with xsl:function
based on xsl:perform-sort e.g. declare some namespace for your function
xmlns:mf="http://example.com/mf"; and define
<xsl:function name="mf:sort-entries" as="element(entry)*">
<xsl:param name="entries" as="element(entry)*"/>
<xsl:perform-sort select="$entries">
<xsl:sort select="isodate"/>
<xsl:sort select="time"/>
</xsl:perform-sort>
</xsl:function>
then you can use
<xsl:for-each-group
select="mf:sort-entries(entry[location=$undulator])" group-by="..."
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