Merge adjacent sibling nodes with XSLT

Question

I have a question that caused me a terrible headache. Please help me. The input is:

 
 section 1 
 


        

Answer 1

With XSLT 2.0 you can use for-each-group group-adjacent as follows:

You can use XSLT 2.0 with Saxon 9 or with AltovaXML tools.