xsl:for-each-group help needed

Question

I went through XSLT Grouping Examples and Using for-each-group for high performance XSLT . I have a problem with for-each-group.

My XML

Answer 1

Here is an XSLT 2.0 stylesheet using for-each-group in a recursive function (I prefer that to a named template with XSLT 2.0):

When I apply that stylesheet with Saxon 9 to the input

   
Introduction
   
XSLT and XQuery
   
XSLT
   

       XSLT is used to write stylesheets.
   
   
XQuery
   

       XQuery is used to query XML databases.
   
   
XQuery and stylesheets
   

       XQuery is used to query XML databases.
   
   
XSLT and XQuery
   
XSLT

I get the result

   
Introduction
   

      
XSLT and XQuery
      

         
XSLT
         


             XSLT is used to write stylesheets.

         
      
      

         
XQuery
         


             XQuery is used to query XML databases.

         
         

            
XQuery and stylesheets
            


                XQuery is used to query XML databases.

            
         
      
   
   

      
XSLT and XQuery
      

         
XSLT