The various Microsoft Office 2003 XML formats such as wordProcessingML
use processing instructions to indicate which application should be used
for opening the file. See
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/WordXML
CDK/html/cdktHTMLConverter_HV01113361.asp
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> -----Original Message-----
> From: Vladimir Gapeyev [mailto:]
> Sent: Sunday, May 08, 2005 7:33 PM
> To:
> Subject: [xml-dev] Well-established uses of processing instructions?
>
>
> I am curious to know to what uses have people put XML
> processing instructions. I am more interested in those that
> have a "community"
> around them (manifesting itself by a de jure or a de facto
> standard, or multiple applications that understand the PI, or
> large amount of document instances with unrelated authorship)
> rather than in made-up samples, however plausible they are.
> Any pointers?
>
> After some search, I am aware of just a couple instances:
>
> (1) http://www.w3.org/TR/xml-stylesheet/ -- W3C
> Recommendation of 1999 on Associating Style Sheets with XML
> documents. How much is this Rec important for non-HTML XML
> documents? (For (X)HTML, the <LINK REL="stylesheet"> element
> appears to be a better solution.)
>
> (2) It appears Apache project Cocoon-1 used PIs, but Cocoon-2
> switched to a more flexible model where association between
> an XML document and a processor is specified by a third,
> separate, document
> (http://wiki.apache.org/cocoon/ThePyramidModel?highlight=%28pr
> ocessing%29%7C%28instruction%29).
>
> Thanks for any help,
>
> Vladimir
>
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