Let me add my voice to the chorus...
The SCHEME attribute is used to identify the categorization scheme
used. <subject scheme="LCSH"> is the canonical example here.
The TYPE attribute is intentionally less rigourously defined. It
allows people to introduce their local distinctions (although we
will probably provide some distinctions they can follow).
In combination with the TYPE attribute, there is no ambiguity
associated with the IDENTIFIER element. A single description might
contain
<IDENTIFIER type="URN">urn:isbn:1-234-5678-9</>
<IDENTIFIER type="URL">http://www.foo.com/bar</>
<IDENTIFIER type="URL">http://www.foo.com.uk/local-bar</>
<IDENTIFIER type="our-local-id">1996-21-03-3-2-2-1</>
Some of the attributes beyond scheme and type arose because we would
have an element (such as relation) that would use both scheme and
type, but we still wanted additional discriminatory capability.
Ron Daniel Jr. email: [log in to unmask]
Advanced Computing Lab voice: +1 505 665 0597
MS B287 fax: +1 505 665 4939
Los Alamos National Laboratory http://www.acl.lanl.gov/~rdaniel/
Los Alamos, NM, USA 87545 obscure_term: "hyponym"
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