Re: level of the next node

  The variable next_level dosen4t contain the number of the next level. Can
  someone give me a tip where the problem is?

presumably
select="number(substring(following-sibling::w:p[node()][1]/w:pPr/w:pStyle/@w:val,13))"
doesn't select what you expected it to select. 

Since you have given no indication of what your input document looks
like, it's not possible to give any advice on how to change it.

David

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