> Doesnt work, because that will include ALL siblings even in other
> chapters.

it will be restricted to one chapter but doesn't work as you ned to
count inside nested sections. (Which you said in your original message
but I didn't take onboard) Do you need to do this in XPath1?
in xslt it's easier to do it with xsl:number (xsl:number from="chapter"
level="any") does just what you want) or if you have to do it in xpath
rather than xslt can you use xpath 2?

David