Re: What is W3C's official position on use of PI?
On Wed, 12 May 1999, Paul Prescod wrote: Paul Prescod <paul@p...> wrote: > Don Park wrote: > > Thanks for clearing that up. Do you what the folks who "regard PIs as > > problematic second-class syntax" recommend for first-class out-of-band > > signaling mechanism? I wouldn't mind giving up PI if there was an > > alternative. > > Well, Liam Quin has been a constant critic of processing instructions. Heh... I always wanted to be remembered for something :-) > http://www.mulberrytech.com/xsl/xsl-list/archive/msg03388.html > http://www.lists.ic.ac.uk/hypermail/xml-dev/9811/0203.html Well, if you read these -- especially the second -- you'll see that they are not arguments against processing instructions. The 2nd article argues against using a processing instruction to link a document to its style sheet in a way that was incompatible with the then current XLink draft, and also incompatible with the DOM. > [Paul's] response: > http://www.mulberrytech.com/xsl/xsl-list/archive/msg03396.html > > As I said in that message, the important thing about processing > instructions is that they are invisible to content models. Yes. This can be good and bad. There's been a tendency in the SGML world to use them like significant comments -- if you've ever seen a large document with <?Pub Stuff> scattered all over it, you'll know what I mean. The usual reaction is that people in such environments write scripts to remove all the processing instructions. > If XML Schemas > invented a way to make elements invisible to content models (like SGML's > inclusion exceptions, but maybe only allowed at the top level) and a way > to add these inclusions to existing schemas easily then processing > instructions could be replaced by these "floating", element types. That > would be neat. I agree, and in some ways this could be where namespaces go, I think. > But if there are no floating element types then we still need processing > instructions. Well, you don't need them in a formal sense, but I agree there there is very strong motivation for them :-) Lee -- Liam Quin, independent SGML/XML/Unix/perl consultant l i a m q u i n at i n t e r l o g dot c o m xml-dev: A list for W3C XML Developers. To post, mailto:xml-dev@i... Archived as: http://www.lists.ic.ac.uk/hypermail/xml-dev/ and on CD-ROM/ISBN 981-02-3594-1 To (un)subscribe, mailto:majordomo@i... the following message; (un)subscribe xml-dev To subscribe to the digests, mailto:majordomo@i... the following message; subscribe xml-dev-digest List coordinator, Henry Rzepa (mailto:rzepa@i...)
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