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Umm... I think one can say it is a limited portion of validation. I think it is reasonable to say that it is a part of validation that might be handled separately because it has to be handled often and means must exist that are more efficient given the frequency, so it is a part of validation that is useful to split away from all the other validation requirements. That is arguable, I agree. But IDness is not part of well-formedness either. XML also tossed it into the XML DTD box and since we had a hand in that, we can't simply kick SGMLAsDemonOfEra. But that is spilt milk. The middle ground here is frequency of application over volume of instances at runtime. This argues for a more effective means for declaring and locating IDs. Again, the medium is one in which location resolution is a primary requirement, so doctrine should be to make that as efficient as possible given the overall benefit to all system users. Since it is a systemic requirement, we can also reasonably argue that a solution which adds to the system vocabulary is a sound approach. len -----Original Message----- From: Tim Bray [mailto:tbray@t...] Sent: Friday, November 02, 2001 11:52 AM To: xml-dev@l... Subject: RE: Re: determining ID-ness in XML At 09:31 AM 01/11/01 -0600, Bullard, Claude L (Len) wrote: > What we are actually >up against are the limits of well-formedness, so we are >starting to mix in validity requirements because we don't >like DTDs or schemas. Nyet. Giving something a unique address is arguably 100% orthogonal to validity. The only reason we mix these two up is that IDs were one of the many things that got thrown into the DTD basket by SGML. > Propose the reason why >the standard means don't work The standard means - DTDs and schemas - are overwhelingly concerned with validation. This is a good and useful thing, but it in a considerable proportion of applications it is not applied at run-time. And being able to find the node to which a pointer applies is a function which can exist entirely independent of validation. QED. -Tim
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