Re: Xpointer Entity
At 12:49 PM -0400 1/19/99, Ogievetsky, Nikita wrote: >Is it (or will it be?) possible to use XPointer as Entity reference? >This will allow me to generic element content, changing depending on >children/ancestors surrounding... (so close to real life...) >Of course it is dangerous as a source of circular references... >- so it will be an extra burden for a parser. I imagine you mean "in" the system identifier of an entity declaration, right? For example, ... <!ENTITY mysection SYSTEM "http://z.com/stuff/mybook.html#id(chap2).child(3,sec)"> ... &mysection; ... I hope and expect that will be the case; it's an obvious and useful application. We discussed it during the development of XPointer. Of course XPointer can't compel applications to support it; but it seems an obvious thing to support if you're writing an app. It's also not really any more work after you've built support for entities in general, and for XPointer in general. I think this adds no more problem for circular entity references, than is already handled for entities in general (SGML prohibits circular entity references, by the way). Anyway, they're not hard to catch. <!ENTITY boom "&boom;"> SGML and XML have the limitation that entities have no parameters; one advantage of is that any time you get a circular reference it must be wrong, because the circle could never terminate. If entities were parameterized somehow, then you could possibly have useful recursion that eventually terminated; but they aren't, so you can't. If you know of any implementations that support this usage, please send me the info and I'll add them to my page about xpointer and xlink implementations at http://www.stg.brown.edu/~sjd/XML-Linking/xptr-implementations.html Steve Steven_DeRose@B...; http://www.stg.brown.edu/~sjd Chief Scientist, Scholarly Technology Group, and Adjunct Associate Professor, Brown University; Chief Scientist, Inso Corporation 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/ 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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