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SGML also cleanly stated that a PUBLIC ID did not have to be resolvable. It is a useful name (really, a compound) but that a system ID does. URI/URN/URL conflates these and while that can be useful as well, it isn't as clean or as clear. It is a case where ease at one level makes confusion at the next. The most practical use for the Semantic Web is to get a machines' opinion. It's an intelligent tutoring system writ big. len -----Original Message----- From: Joe English [mailto:jenglish@f...] Although I still believe the URL vs. URN distinction is a useful one, it seems that even if you publish a URI that's intended to be used only as a Locator, somebody else is going to come along later and use it as a Name. I guess what I'm trying to say is that the question of "how to process a URI" might be as meaningless as the question of "how to process an XML document". SGML gained most of its utility by divorcing processing expectations from the markup; perhaps the URI philosophy will enable more of the same.
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