RE: [xsl] nesting flat XML based on attribute value.

Subject: RE: [xsl] nesting flat XML based on attribute value.
From: "Michael Kay" <mike@xxxxxxxxxxxx>
Date: Wed, 14 Dec 2005 11:46:49 -0000
> It seems that for each section the recursion groups them
> nicely but then when
> it exist the recursion it applies the same again to <sec>
> tags that have
> already been grouped therefore sec's are getting output twice, e.g.

Then your template rule for the "ch" element (which you haven't shown us,
and which I didn't actually write for you) appears not to be selecting the
"top-level" sections, but is actually processing all of the sections.

I didn't supply this code because I don't know your data well enough. It
might be that all sec elements with an 8-character id value are top-level,
or the rule might be more complicated.

Michael Kay
http://www.saxonica.com/

>
> <?xml version="1.0" encoding="iso-8859-1"?>
> <doc>
>     <ch id="1o1">
>         <sec id="sec1o1o1" fpage="3" lpage="5"/>
>         <sec id="sec1o1o1o1" fpage="3" lpage="3"/>
>         <sec id="sec1o1o1o2" fpage="3" lpage="4"/>
>         <sec id="sec1o1o1o3" fpage="4" lpage="4"/>
>         <sec id="sec1o1o1o4" fpage="4" lpage="5"/>
>         <sec id="sec1o1o1o5" fpage="5" lpage="5"/>
> ...
>
> goes to
>
> <?xml version="1.0"?>
> <doc>
>     <ch id="1o1">
>         <sec id="sec1o1o1" fpage="3" lpage="5">
>             <sec id="sec1o1o1o1" fpage="3" lpage="3"/>
>             <sec id="sec1o1o1o2" fpage="3" lpage="4"/>
>             <sec id="sec1o1o1o3" fpage="4" lpage="4"/>
>             <sec id="sec1o1o1o4" fpage="4" lpage="5"/>
>             <sec id="sec1o1o1o5" fpage="5" lpage="5"/>
>         </sec>
>         <!-- these have already been output -->
>         <sec id="sec1o1o1o1" fpage="3" lpage="3"/>
>         <sec id="sec1o1o1o2" fpage="3" lpage="4"/>
>         <sec id="sec1o1o1o3" fpage="4" lpage="4"/>
>         <sec id="sec1o1o1o4" fpage="4" lpage="5"/>
>         <sec id="sec1o1o1o5" fpage="5" lpage="5"/>
>
> it needs to some how remember what it has already grouped
> (sorry for the
> procedural thinking here.)
>
> This isn't too much of a problem in this case because I can
> remove those extra
> sec tags with a second script based on depth.
>
>    Dave.
>
>
> > The key to this is to do a recursive descent using
> xsl:apply-templates, but
> > instead of selecting the physical children of the current
> node in the XML
> > tree as you normally would, you select the *logical*
> children, for example
> >
> > <xsl:template match="sec">
> > <xsl:copy>
> >   <xsl:apply-templates select=
> >      "//sec[string-length(@id)=string-length(current()/@id)+2 and
> > starts-with(@id, current()/@id)]"/>
> > </xsl:copy>
> > </xsl:template>
> >
> > Michael Kay
> > http://www.saxonica.com/
> >
> > > -----Original Message-----
> > > From: David Holden [mailto:dh@xxxxxxxx]
> > > Sent: 13 December 2005 17:39
> > > To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> > > Subject: [xsl] nesting flat XML based on attribute value.
> > >
> > >
> > >
> > > Hello,
> > >
> > >  I'm not sure whether I'm being dumb or not here but I'm
> > > stuck on converting a
> > > flat structure to a nested structure.
> > >
> > > the flat structure is like this:-
> > >
> > > <?xml version="1.0 " encoding="US-ASCII"?>
> > > <doc>
> > >   <ch id="1o1">
> > >     <sec id="sec1o1o1" fpage="3" lpage="5" />
> > >     <sec id="sec1o1o1o1" fpage="3" lpage="3"/>
> > >     <sec id="sec1o1o1o2" fpage="3" lpage="4"/>
> > >     <sec id="sec1o1o1o3" fpage="4" lpage="4"/>
> > >     <sec id="sec1o1o1o4" fpage="4" lpage="5"/>
> > >     <sec id="sec1o1o1o5" fpage="5" lpage="5"/>
> > >     <sec id="sec1o1o2" fpage="5" lpage="7"/>
> > >     <sec id="sec1o1o2o1" fpage="5" lpage="5"/>
> > >     <sec id="sec1o1o2o2" fpage="5" lpage="5"/>
> > >     <sec id="sec1o1o2o3" fpage="5" lpage="6"/>
> > >     <sec id="sec1o1o2o4" fpage="6" lpage="7"/>
> > >     <sec id="sec1o1o2o4o1" fpage="6" lpage="6"/>
> > >     <sec id="sec1o1o2o4o2" fpage="6" lpage="6"/>
> > >     <sec id="sec1o1o2o4o3" fpage="6" lpage="7"/>
> > >     <sec id="sec1o1o3" fpage="7" lpage="10"/>
> > >     <sec id="sec1o1o3o1" fpage="7" lpage="7"/>
> > >     <sec id="sec1o1o3o1o1" fpage="7" lpage="7"/>
> > >   </ch>
> > > </doc>
> > >
> > > I would like to get to
> > >
> > > <?xml version="1.0" encoding="US-ASCII"?>
> > > <doc>
> > >   <ch id="1o1">
> > >     <sec id="sec1o1o1" fpage="3" lpage="5">
> > >       <sec id="sec1o1o1o1" fpage="3" lpage="3"/>
> > >       <sec id="sec1o1o1o2" fpage="3" lpage="4"/>
> > >       <sec id="sec1o1o1o3" fpage="4" lpage="4"/>
> > >       <sec id="sec1o1o1o4" fpage="4" lpage="5"/>
> > >       <sec id="sec1o1o1o5" fpage="5" lpage="5"/>
> > >     </sec>
> > >     <sec id="sec1o1o2" fpage="5" lpage="7">
> > >       <sec id="sec1o1o2o1" fpage="5" lpage="5"/>
> > >       <sec id="sec1o1o2o2" fpage="5" lpage="5"/>
> > >       <sec id="sec1o1o2o3" fpage="5" lpage="6"/>
> > >       <sec id="sec1o1o2o4" fpage="6" lpage="7">
> > >         <sec id="sec1o1o2o4o1" fpage="6" lpage="6"/>
> > >         <sec id="sec1o1o2o4o2" fpage="6" lpage="6"/>
> > >         <sec id="sec1o1o2o4o3" fpage="6" lpage="7"/>
> > >       </sec>
> > >     </sec>
> > >     <sec id="sec1o1o3" fpage="7" lpage="10">
> > >       <sec id="sec1o1o3o1" fpage="7" lpage="7">
> > >         <sec id="sec1o1o3o1o1" fpage="7" lpage="7"/>
> > >       </sec>
> > >     </sec>
> > >   </ch>
> > > </doc>
> > >
> > > i.e.  both the nesting "level" and "order" are in the id
> attribute.
> > >
> > > any tips appreciated.
> > >
> > >  Dave.
>
>
> --
> Dr. David Holden.
> Please avoid sending me Word or PowerPoint attachments, thanks.
> See: <http://www.gnu.org/philosophy/no-word-attachments.html>
> Public GPG key available on request.
> -------------------------------------------------------------

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