Michael Kay mike(_at_)saxonica(_dot_)com wrote:
Following just a week after the XSLT 3.0 Candidate Recommendation
from W3C, we are delighted to announce the release today of Saxon
9.7.
It is great to have an implementation to explore the candidate
recommendation.
I have a question on
http://www.w3.org/TR/xslt-30/#element-for-each-group, the Saxon 9.7
documentation at
http://saxonica.com/html/documentation/xsl-elements/for-each-group.html
says:
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XSLT 3.0 introduces the ability to bind variables to the current group
and the current grouping key as an alternative to using the functions
current-group() and current-grouping-key(). The advantage of using
variables is that they have static scope, so the optimizer has more
chance to see what the stylesheet is doing with each group. Streamed
processing is only possible if the new variables are used, as this
enables the processor to determine whether or not the use of the current
group is streamable.
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How can I bind variables to use streaming in the current candidate
recommendation version of XSLT 3.0?
An earlier draft in
http://www.w3.org/TR/2012/WD-xslt-30-20120710/#xsl-for-each-group defined
<xsl:for-each-group
select = expression
group-by? = expression
group-adjacent? = expression
group-starting-with? = pattern
group-ending-with? = pattern
bind-group? = eqname
bind-grouping-key? = eqname
composite? = "yes" | "no"
collation? = { uri } >
<!-- Content: (xsl:sort*, sequence-constructor) -->
</xsl:for-each-group>
where I understand the attributes bind-group and bind-grouping-key to
have that role, but I don't see anything like that in the current
definition with
<xsl:for-each-group
select = expression
group-by? = expression
group-adjacent? = expression
group-starting-with? = pattern
group-ending-with? = pattern
composite? = boolean
collation? = { uri } >
<!-- Content: (xsl:sort*, sequence-constructor) -->
</xsl:for-each-group>
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