[xsl] Numbering similar nodes sequentially in the output

I suspect this cannot be done, but will ask. Is it possible to sequentially 
number similar nodes in the output? For instance, part of my current output 
is:
<FormatPage souvenir-sheet="365">
  <FormatButtons>
    <Formats se-tenant="365"/>
    <Formats coupon="367"/>
    <Formats coupon="368"/>
  </FormatButtons>
</FormatPage>

I would like to make that
<FormatPage souvenir-sheet="365">
  <FormatButtons>
    <Formats se-tenant="365"/>
    <Formats label='1' coupon="367"/>
    <Formats label="2" coupon="368"/>
  </FormatButtons>
</FormatPage>

or, for a more complex example, an output of
<FormatPage souvenir-sheet="365">
  <FormatButtons>
    <Formats label='1' se-tenant="365"/>
   <Formats label='2' se-tenant="367"/>
    <Formats label='1' coupon="367"/>
    <Formats label='2' coupon="368"/>
  </FormatButtons>
</FormatPage>

That is, inserting a sequential label attribute in the <Formats> that have 
the same attribute. The original position() of the <Formats> in the input 
file is most likely irrelevant and misleading, and I suspect trying to count 
the different input <Formats> may be just as useless. My only interest is in 
sequentially numbering multiple <Formats> bearing the same attribute. If 
this might be possible, I can submit for a selected set of sample inputs, 
the output and current stylesheet. Otherwise, I'll just give up on it. Only 
se-tenant and coupon attributes require this treatment.
Thanks,
Mark




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