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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=%28processing%29%7C%28instruction%29). Thanks for any help, Vladimir
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