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Re: Attributes with Intent

  • From: Peter Murray-Rust <peter@u...>
  • To: David Megginson <ak117@f...>, xml-dev@i...
  • Date: Mon, 04 May 1998 14:02:52

Re: Attributes with Intent
At 08:33 04/05/98 -0400, David Megginson wrote:
>Peter Murray-Rust writes:
> > It's reasonable to assume that generic text-aware XML software
> > might be asked "please find all elements in a document which are
> > expressed in German." It can't look for all elements with
> > xml:lang="de" because they don't have this explicitly. So general
> > mechanisms such as XPointers can't be used, and bespoke software
> > must be written. This software (presumably) finds all elements
> > which *do* have the attribute and continues recursively.
>From a logical perspective, your query is simply
>  Find all elements in a document where the element or the nearest
>  ancestor with a value for the xml:lang attribute specifies "de" as
>  the attribute's value.
>With SDQL, for example, this test is surprisingly simple:
>  (equal? (inherited-attribute-string "xml:lang") "de")
>Your point is well-taken, though: fragments of XML documents are often
>tightly bound to their context (similar situations would involve
>attributes for effectivity, security level, revision status, etc.).
>All the best,
>David Megginson                 ak117@f...
>Microstar Software Ltd.         dmeggins@m...
>      http://home.sprynet.com/sprynet/dmeggins/
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Peter Murray-Rust, Director Virtual School of Molecular Sciences, domestic
net connection
VSMS http://www.nottingham.ac.uk/vsms, Virtual Hyperglossary

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