Am 14.07.2017 um 09:09 schrieb Felix Sasaki felix@xxxxxxxxxxxxxx:
>
> I want to analyse a list of transactions in XSLT 3.0 streaming mode. 
> Transactions should be grouped by a key which is nested inside each 
> transaction (see SUBITEM2.2/GROUPING-KEY below). For the grouped 
> transactions, there are items to count or items with numeric values to 
> some up, see ITEM1 and ITEM2/SUBITEM2.1.
>
>
> <TRANSACTION-LIST>
>   <TRANSACTION>
>     <ITEM1> something to count </ITEM1>
>     <ITEM2>
>       <SUBITEM2.1> something to sum up</SUBITEM2.1>
>       <SUBITEM2.2> ...
>         <GROUPING-KEY>some-key</GROUPING-KEY>
>       </SUBITEM2.2>
>     </ITEM2>
>   </TRANSACTION> ...
> </TRANSACTION-LIST>
>
>   The output should be a list as follows:
> - Transaction following grouping key value 1:
>     Numbers of ITEM1
>     Sum of ITEM 2
> - Transactions following grouping key value 2, 3, ...n: the same list 
> with other values.
>
See also 
https://stackoverflow.com/questions/44287959/xslt-3-0-streaming-with-grouping-and-sum-accumulator/44291127#44291127 
for a similar problem and some worked out code samples trying to tackle 
the problem.