Worth saying at this point that this is EXACTLY how ONIX is structured:
<entityIdentifier>
<entityIDType>
<IDTypeName>
<IDValue>
</entityIdentifier>
where 'entity' might be 'product', 'work', 'name', or whatever. There is a controlled vocabulary for common IDTypes, and if you have some proprietary identifier not in the list, you must include a 'likely to be unique' name for it in <IDTypeName> instead.
A point of history -- ONIX started (in 1999) with a property per identifier type: there were tags called <ISBN> and <UPC>, but as pointed out below, that isn't really practical, so the above XML structure is used extensively now. It's easy to add to the controlled vocabulary when a new identifier comes along, without having to change the schema. In UML, it looks like the attached, and I leave the RDF as an exercise for the reader...
Graham
Graham Bell
EDItEUR
Tel: +44 20 7503 6418
Mob: +44 7887 754958
EDItEUR Limited is a company limited by guarantee, registered in England no 2994705. Registered Office: United House, North Road, London N7 9DP, UK. Website: http://www.editeur.org
On 3 Dec 2012, at 16:18, Laura Dawson wrote:
That might work, actually.
Sent from my iPhone
On Dec 3, 2012, at 4:05 PM, Karen Coyle <kcoyle@kcoyle.net<mailto:kcoyle@kcoyle.net>> wrote:
On 12/3/12 7:19 AM, Richard Wallis wrote:
Hi Shlomo,
Couple of points.
*Identifiers: *This is a particular concern of mine.
Me, too!
The approach of
having a named property for each possible identifier that a CreativeWork
or a Person could have, just does not scale. However to handle this you
will always be disenfranchising some identifier backing group. Isbn
seems to of got in because it is know by everyone, oclcnum is obvious
from where I sit (but that does not make it right). I think we (in all
of Schema, not just the bib domain) need an identifier Type with
properties of ‘identifierValue’ and ‘identifierType’ - which could
handle either an enumerated list or at least well known identifier names.
I believe that this means that "Identifier" becomes a "schema" in schema.org<http://schema.org>.
kc
~Richard.
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