[XML-DEV Mailing List Archive Home] [By Thread] [By Date] [Recent Entries] [Reply To This Message] narrowing a DTD
Hello! EXECUTIVE SUMMARY: I would like to take a currently existing DTD (e.g. Scalable Vector Graphics, SVG), _overlay_ some different semantics onto it, and create a subset of the SVG DTD. DISCUSSION: I would like to create a SVG document that is 100% SVG with no new ELEMENTS, ENTITIES or anything. However, I'm creating this document from some other data structure that does not map 1:1 to SVG. I would like this *mapping* to be a *standard* in it's own right for use in a particular community. Essentially, I would like an SVG-like DTD, a pure subset with different semantics, that would be used to create the SVG-overlay document. The full SVG DTD can still be used to *extend* the SVG-overlay DTD, but when we go to parse the SVG-overlay document, we can ignore the extended SVG and just go for the SVG-overlay stuff knowing that the creator of the document used the SVG-overlay DTD and that the ELEMENTS and things mean what we think they mean. On the other hand, we can pass the SVG document and the full SVG DTD to an SVG drawing program, and it will have no problems just drawing the picture as usual. So that is what I want; question is, how do I do it? My immediate response is to take the SVG DTD and start removing things, but that's not enough. We need to use some of the CDATA attributes to hold specific information in a specific format; this would imply that we need to "override" declarations in the original DTD somehow. It may also be necessary to increase the restrictions on ELEMENT declarations. Nothing needs to be added or relaxed. (If this weren't not true, I would say all is lost, but this is a narrowing, not a broadening.) I'm trying to be concise, but if I'm not being clear, I'll be happy to try again. Any light shed on this problem will be greatly appreciated. Thanks! B-) -- Bill Wadley |GAT/d-(++) s++: a C++++ UL++++$ P++++$ L+++>++++ E- W+++$ | bill@w... |N+++ w-- O-- M-- PS+ PE Y++ PGP++ t++ 5++ X- R+ tv b++++ D++| bill.wadley.org |G++ e* h--- r+++ y? bill.wadley.org/PGP_KEY.html | "The dinosaurs became extinct because they didn't have a space program." -Larry Niven 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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