Hi Mikael,
(Sorry, my last post crossed with yours and Andy's)
Quoting Mikael Nilsson <[log in to unmask]>:
> On Thu, 2005-02-10 at 13:30 +0000, Andy Powell wrote:
>
> > As an example, what I think Mikael has done with his RDF version of LOM is
> > to re-declare the LOM 'elements' as RDF properties using a different
> > namespace URI. These LOM/RDF properties become usable in DC descriptions
> > in a way that the original XML Qnames used in LOM/XML instances are not.
>
> Yes, this is what I did. In the original version I even mentioned that
> the binding was "dc-compatible", i.e. compatible with the then
> non-existent DCAM :-)
I guess I still think that process is rather more than "re-declaring" though -
there is actually quite a lot of "re-modelling" involved in the LOM RDF
mapping, looking at what information the LOM tree represents in terms of
relations between resources, rather than the tree structure itself (e.g. the
whole MetaMetadata thing, Relation.Role, Classification etc).
There is no necessary one-to-one mapping between an XML element in an XML tree-
structure and an RDF property. You have to look beyond the tree-structure at
the information which is being represented by that structure - unless you just
want to create an RDF representation of the XML Infoset, (element-1 is-child-of
element-2 and so on) which might be a satisfying academic exercise but doesn't
get us very far ;-)
> Note that to use the URIs defined in the RDF version of LOM in an XML
> DCAP would be strange, to say the least, as it would be in conflict with
> the LOM XML binding. Unfortunately there is currently no solution to
> this conflict.
Yes. That's what I meant when I was saying XML elements and RDF properties are
different things.
> I think the lesson here is that the DCAM is pretty useful, or indeed
> absolutely essential, and that the corresponding AMs of METS and LOM
> (the hierarchical models) are actually not as useful.
>
> An external entity that defines its terms so that they comply with the
> DCAM *OR* RDFS are actually on the safe side, METS and LOM do
> neither :-(
Right. Nor does MODS. :-(
Pete
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Pete Johnston
Research Officer (Interoperability)
UKOLN, University of Bath, Bath BA2 7AY, UK
tel: +44 (0)1225 383619 fax: +44 (0)1225 386838
mailto:[log in to unmask]
http://www.ukoln.ac.uk/ukoln/staff/p.johnston/
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