Re: [xsl] [ANN] Saxon 9.7 released today

["Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Michael Kay mike@xxxxxxxxxxxx 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:

---------------------------------------------------------------------
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.
---------------------------------------------------------------------

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>