[xslt] Very simple question, major headache.

["Patrick Bergeron" <pbergeron innobec com>]

I have a XML document with a list of records:

<Record>
    <Data />
</Record>
<Record>
<Record>
<......>
<Record>


And I need to output some of these records, but not all of them. The rules
upon which I decide to output are complex, and I won't bore you with the
details.

Also, after every 5th record has been output, I need to write some kind of
marker in the output stream.

Something like this:

Marker
Record 1
Record 23
Record 45
Record 70
Record 72
Marker
Record 83
....



How exactly would I go about doing this?

In any other language, it's easy easy:

If (yes_output_record)
{
   count = count + 1;

   if (count modulo 5 = zero)
      output_marker();

   output_record();
}


I can't understand why it's so complicated to do something like this.
Surely there must be some "easy as pie" solution out there?