counter in XSL - cant use xsl:number/postion with my problem

hi,

i got something like the following problem:

[xsl:template name="foo"]
...
[xsl:apply-templates match="book" /]
...
[xsl:template name="book"]
[xsl:if test="this test doesnt depend on book.nodeValue but on the .xml 
book.nodeValue links to"]
[xsl:variable name="counter"]$counter+1[/xsl:variable]
...
[/xsl:if]


... my .xsl processes a .xml which links to several .xml (docbook-books).
the template matching book decides wether the current book fits the context and 
if so 
puts its title in a fo:list (the book.xml is loaded by document() ).
problem:
unlike html fo doesnt increment list-labels automatically, so i have to quote 
the label explicit.
i cant use xsl:number or xsl:position cause the labels dont depend on the 
postion of the book nodes, 
but on the kind of book.xml the book-nodes link to.


thx in advance,

sebastian




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