RE: Increment value by group?

It looks to me as if the processing of each group is independent of the
processing of any other group (because the running total starts at 1 for
each group) and therefore you can use for-each-group to split the data into
groups. But within each group, the processing of each item depends on the
results of processing previous items, so it can't be done with a simple
for-each - it needs recursion.

So the structure you want is along the lines 

for-each-group select="job" group-adjacent="quantity"
  call-template name="recurse"
   with-param name="group" select="current-group()"
   with-param name="running-total" select="0"
  /call-template
/for-each-group

where the recursive named template processes the first element in the group,
and then calls itself to process the remainder of the group, passing an
incremented running-total as the parameter.

Michael Kay
http://www.saxonica.com/

> -----Original Message-----
> From: watchstone@xxxxxxxxxxx [mailto:watchstone@xxxxxxxxxxx] 
> Sent: 20 January 2006 19:12
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject:  Increment value by group?
> 
> Hello:  I want to process nodes based on grouping by 
> <quantity>. The  <increment> element is used as a running 
> "total" based on grouping.  So basically, when <quantity> is 
> "1", I want to process all of them as a group and use the 
> <increment> value to produce an output like this:
> 
> 1/1-3 (i.e. <increment> value was "3")
> 1/4-5 (i.e. <increment> value was "2" but starts where
> preceding value left off)
> 
> When <quantity> changes, I want the <increment> value to also 
> start over with "1".
> 
> Can I use <xsl:for-each-group> or some such element to 
> accomplish this?  Thanks for any tips.  I'm stumped!
>  
> <?xml version="1.0"?>
> <document>
> <job>
> <quantity>1</quantity>
> <increment>3</increment>
> </job>
> <job>
> <quantity>1</quantity>
> <increment>2</increment>
> </job>
> <job>
> <quantity>2</quantity>
> <increment>4</increment>
> </job>
> <job>
> <quantity>2</quantity>
> <increment>1</increment>
> </job>
> </document>
>  
> Desired output:
> <document>
> <job>
> <status>1/1-3</status>
> </job>
> <job>
> <status>1/4-5</status>
> </job>
> <job>
> <status>2/1-4</status>
> </job>
> <job>
> <status>2/5</status>
> </job>