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Ann Navarro scripsit: > I've never claimed to be a parser developer, but I don't believe that > they'd have to be built into the parser itself. Currently, parsers have five built-in entities: references to those are always understood (namely lt, gt, quot, apos, amp). To get parsers to understand more entity references, you use a DTD to declare the entities you want, either one-by-one in the internal subset or in bulk using an external parameter entity/external subset. > You can't > define entities in XML Schema (except by using a DTD, which doesn't count, > IMO). Let's fix that, and it would work just as entities defined in DTDs > would. Problem solved for XHTML, and any other language development effort. Then you wind up with documents that contain entity references but don't declare any entities. That's not well-formed XML 1.x. (You can make it technically well-formed but invalid by using a dummy DTD with a dummy external subset.) As long as entity references are resolved at parse time, they simply can't be done at schema validation time; schema validation is defined on the output of parsing. -- One art / There is John Cowan <jcowan@r...> No less / No more http://www.reutershealth.com All things / To do http://www.ccil.org/~cowan With sparks / Galore -- Douglas Hofstadter
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