Thanks,
Mark

Hi,
Consider:
<xsl:for-each-group select="current-group()" group-by="Stamp/@line"

This fails because @line is an optional attribute and does not always
appear in the XML. The only cure I can think of is to run a
pre-processing stylesheet that, should the @line attribute be absent
from a <Stamp> element, adds an @line="0" to each <Stamp> element. This
is not a problem, but I wondered if there were another more elegant
means making the group-by work?

I tried to formulate an alternative, thinking this would group-by the
true value of @line were it present, or by zero in its absence, but it
fails:
<xsl:for-each-group select="current-group()" group-by="if(Stamp/@line)
then Stamp/@line else 0">

what you wrote should be legal but whether it "works" depends on how you
want things to group.

usually does what I want in these situations, but whether it does what
you want, I can't guess:-)

if you select nothing then things go in no group, but by using string()
you never select nothing and things without the attribute end up in the
group keyed on the string "". this assumes that there is at most one
Stamp child.

--
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