[xsl] XSLT 2.0 & Grouping

[Mark Brand <mark.brand@xxxxxxxxxxxxxxxxxxxx>]

Hi all

I am having some issues with understanding the for-each-group mechanism 
in XSLT 2.0
and how I can apply it to my particular situation. Michael Kay yesterday 
pointed me at some positional grouping information which may appear to 
offer a solution. But i can't get my head around how to manage the 
nesting aspects. That is having to output
an opening <PART> tag and then managing all the child tags and then
coming back somehow to put in the closing </PART> tag. I am using XSLT 
2.0 Saxon 7.5 and I would really like some help on  this - as I am a bit 
stuck.

===Problem Context =============================================
I need to iterate through each paragraph in the Source XML document (below)
and depending on what the paragraph style is i need to output
some markup & content whilst keeping the nesting (PARTS, contain DIVISIONS,
contain SUBDIVISIONS contain REGULATIONS contain SUB-REGULATIONS etc.) 
intact

=== Source XML Document ========================================
<Document>
   <Paragraph StyleName="PART">..................</Paragraph>
   <Paragraph StyleName="DIVISION">..............</Paragraph>
   <Paragraph StyleName="SUBDIVISION">...........</Paragraph>
   <Paragraph StyleName="REGULATION">............</Paragraph>
   <Paragraph StyleName="SUB-REGULATION">........</Paragraph>
   <Paragraph StyleName="PARAGRAPH">.............</Paragraph>
   <Paragraph StyleName="SUB-PARAGRAPH">.........</Paragraph>
   <Paragraph StyleName="SUB-PARAGRAPH">.........</Paragraph>
   <Paragraph StyleName="SUB-SUB-PARAGRAPH">.....</Paragraph>
   <Paragraph StyleName="SUB-SUB-PARAGRAPH">.....</Paragraph>
   <Paragraph StyleName="SUB-PARAGRAPH">.........</Paragraph>
   <Paragraph StyleName="SUB-PARAGRAPH">.........</Paragraph>
   <Paragraph StyleName="SUB-SUB-PARAGRAPH">.....</Paragraph>
   <Paragraph StyleName="SUB-SUB-PARAGRAPH">.....</Paragraph>
   <Paragraph StyleName="PARAGRAPH">.............</Paragraph>
   <Paragraph StyleName="SUB-PARAGRAPH">.........</Paragraph>
   <Paragraph StyleName="SUB-SUB-PARAGRAPH">.....</Paragraph>
   <Paragraph StyleName="SUB-SUB-PARAGRAPH">.....</Paragraph>
   <Paragraph StyleName="SUB-PARAGRAPH">.........</Paragraph>
   <Paragraph StyleName="SUB-PARAGRAPH">.........</Paragraph>
   <Paragraph StyleName="SUB-SUB-PARAGRAPH">.....</Paragraph>
   <Paragraph StyleName="SUB-SUB-PARAGRAPH">.....</Paragraph>
   <Paragraph StyleName="SUB-SUB-PARAGRAPH">.....</Paragraph>
   <Paragraph StyleName="SUB-PARAGRAPH">.........</Paragraph>
   <Paragraph StyleName="SUB-REGULATION">........</Paragraph>
   <Paragraph StyleName="SUB-REGULATION">........</Paragraph>
   <Paragraph StyleName="SUB-REGULATION">........</Paragraph>
   <Paragraph StyleName="SUB-REGULATION">........</Paragraph>
   <Paragraph StyleName="NOTE">..................</Paragraph>
</Document>

=== Required Output ======================
<Regulation>
   <Part Category="PART">
       <Part Category = "DIVISION">
           <Part Category = "SUBDIVISION">
               <Article>
                   <Sub-Article>
                       <Paragraph>
                           <Sub-Paragraph/>
                           <Sub-Paragraph>
                               <Sub-Sub-Paragraph>
                               <Sub-Sub-Paragraph>
                           <Sub-Paragraph/>
                           <Sub-Paragraph/>
                           <Sub-Paragraph>
                               <Sub-Sub-Paragraph/>
                               <Sub-Sub-Paragraph/>
                           </Sub-Paragraph>
                       </Paragraph>
                   </Sub-Article>
              </Article>
           </Part>
       </Part>
   </Part>
</Regulation>


Best Regards & Thanks
Mark Brand



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