2. If your group by patttern evaluates to an empty element
current-grouping-key() will yield nothing. However one may (as I did)
want to get at the attributes of such an element but this is not
possible.
current-grouping-key() will not yield "nothing"
it will yield the empty string (if a sequence of empty strings,
duplicates are removed)
All the element that have a grouping key = empty string, will be in
the group with current-grouping-key() = ''
and you will have access to their attributes without a problem.
You will have to expand on this to explain what exactly your problem
is, so we can help you get around this
3. If you group-starting-with it's weird to then see things not
encompassed by the starting-with expression appear as a group because
they precede the first occurrence of the starting-with expression.
While this works as specified because for-each-group is a total
function over the population it does result in a mismatch between the
grammatical semantic and the exhibited behaviour, or to put it another
way it does what it says in the spec but doesn't do what it says on
the tin.
Thank God a programming language does as per specification ;-)
If you don't want that preceding group simply get rid of it using some test
For me the semantics is right...
all nodes selected are grouped without throwing away selected nodes
I think for both 2. and 3. the answer in 1. will help you understand
the mechanism
cheers
Geert
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