Internal subset equivalent in new schema proposals?

John Cowan cowan at
Mon Nov 30 18:44:59 GMT 1998

Paul Prescod wrote:

> If I have an element that teaches a topic, and I give it an ID, and then I
> delete that chapter, but there is another chapter that could also teach
> the topic, shouldn't I be able to transfer the ID?

IMO no.  Two objects with the same ID are really the *same* object,
not just equivalent for a specified purpose.  (To a learner, your
chapters might be equivalent; to a bibliographer, they wouldn't be.)

> Anyhow, whether names are arbitrary or not, the real problem is that there
> is only one ID namespace when we really need many of them. IDs name an
> element, but elements can need multiple names, just as anything else can.

Yes, but IDs aren't the way to model user-friendly names.  This
email has many "names", but only one Message-ID, which is as it should
be; that Message-ID is globally unique unless there are bugs somewhere.

John Cowan		cowan at
	You tollerday donsk?  N.  You tolkatiff scowegian?  Nn.
	You spigotty anglease?  Nnn.  You phonio saxo?  Nnnn.
		Clear all so!  'Tis a Jute.... (Finnegans Wake 16.5)

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