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RE: Matching a recursive local element structure

Subject: RE: Matching a recursive local element structure
From: "David Lee" <dlee@xxxxxxxxxxx>
Date: Fri, 4 Feb 2011 20:06:18 -0500
RE:  Matching a recursive local element structure
Thanks for the ideas (all!)
Let me restate my question maybe it might lead to another idea  (I'm still
floundering !)

For every element declaration in an XSD I would like to generate a unique
XSLT match expression that matches that element declaration (but no others).
I've got it working quite well for both global and local elements until I
hit a recursive structure then well ... it recurses :)

Thanks for any suggestions !

I *feel* this should be solvable because while the structure are infinitely
recursive, each level of the recursion matches the same element declaration
so shouldnt have to be unrolled ... I just cant yet get my head around a
match expression to catch it right.

But maybe its not finitely solvable ?

David A. Lee

-----Original Message-----
From: Brandon Ibach [mailto:brandon.ibach@xxxxxxxxxxxxxxxxxxx]
Sent: Friday, February 04, 2011 7:44 PM
To: xsl-list
Subject: Re:  Matching a recursive local element structure

Perhaps this approach is not as generic as you may have had in mind,
but for this case, I think it would work.

<template match=section/text//list/item[not(ancestor::subheading)] > 

-Brandon :)

On Fri, Feb 4, 2011 at 7:01 PM, David Lee <dlee@xxxxxxxxxxx> wrote:
> Suppose I have a schema which describes a recursive structure as local
> elements.
> Example (pseudo DTD, and pseudo xml I can provide more formal defs if
> )
> Element section  (text)*
> Element text ( list | para | bold | #PCDATA )*
> Element list ( item*)
> Element item ( text | subheading ) *
> Element subheading (text)*
> So for example doc may look like
> <section>
>   <text>Text
>       <list>
>                       <item><para>Item Text</para></item>
>                       <item><para>Item Text2</para></item>
>                       <item><para>Item Text</para>
>       <list><item><para>More text> </item></list></para></item>
>                 </list>
>    </text>
> </section>
> The key point is that the schema is recursive, so an xpath (or xslt match)
> might be
>                 section/text
>                 section/text/list/item/para
> section/text/list/item/list/item/list/item/list/item/list/item . Can get
> really long here !!!!
> Now suppose I want to avoid an infinite number of XSLT match strings but I
> want to match say list/item but ONLY within section/text
> (presume there may be a different list/item locally defined within say
> subheader)
> Suggestions on to a good way to do that ?
> <template match=section/text//list/item > 
> But this might match
>                 section/text/subheading/list/item
> or
>                 section/text/list/item/subheading/list/item
> which I dont want.
> I only want to match the list/item which is a local element definition
> below section  (recursively),.
> so the match should select
>                 section/text/list/item/list/item/list/item
> but not
>                 section/text/list/item/subheading/list/item
> ( which I would say match with
>                 subheading/list/item
>                 subheading/list/item/list/item
> )
> Is there an obvious way to do this ?
> Its entirely possible that Im asking an impossible question (that is the
> schemas may simply not allow this restriction in the first place),
> But Im trying to solve a general problem so asking a general question.
> This is based on generating match strings from XSD element declarations so
> its really a XSD question as well 
> Maybe its impossible to describe a schema such that a descendant
> is distinguishable if its under section or subheading ?
> Thanks for any suggestion !
> -David
> ----------------------------------------
> David A. Lee
> dlee@xxxxxxxxxxx
> http://www.xmlsh.org
> ----------------------------------------
> David A. Lee
> dlee@xxxxxxxxxxx
> http://www.xmlsh.org

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