For-each grouping in streaming.

I am reworking my xslts and i have seen that i am using
<xsl:for-each group select = "AnimalKingdomGroup/copy-of(.)" group-by =
"groupName"/>
When i remove the template that does this , the end tags are copied fine.
I am thinking there should be something about the grouping . what is the
best way to do this ? If i don't put copy of, then i know its an error that
i am accessing the tree twice in same context.

But copy-of is also bad because animalKingdomGroup will be massive and i
know that .
Any advices here ?
Thanks.
Dt
Ps: i am also making a repro of my code to upload in saxon bug list..

>
>
> On Aug 18, 2016 11:57 AM, "Michael Kay mike@xxxxxxxxxxxx" <
xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>>
>> Your stylesheet may be exhibiting the same bug as listed on our web
site, or it might be a different bug with similar symptoms. Give us the
details, and we'll be happy to check it out. It could turn out be something
completely different, like a failure to close the output stream. When we
know what it is, we can start looking for a workaround.
>>
>> We are always looking for more test cases, so please feel free to submit
the problem case in a form that we can run.
>>
>>
>>> On 18 Aug 2016, at 15:25, Vasu Chakkera vasucv@xxxxxxxxx <
xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>>>
>>> So, i can assume that the stylesheet that works once under will always
work...
>>>
>>>
>>
>> Not always. Some problems are due to multi-threading, or to other
effects like hashing that effectively randomise the order of execution, so
don't always repeat the same way. But you'll spot that fairly quickly if
you are disciplined about running repeatable and automated tests of your
code.
>>
>> Michael Kay
>> Saxonica
>> XSL-List info and archive
>> EasyUnsubscribe (by email)