On 01/05/10 15:27, Stuart Sutton wrote:
> Can you say a bit more about how a LOM instance might entail
> multiple occurrences of the Education category and remain strictly
> conforming? I know this is certainly not the forum for any in-depth
> explanation or conversation, but a quick example might be useful
> here.
To throw a few numbers into the discussion, last week I harvested
ARIADNE using OAI-PMH and converted all metadata instances according to
Mikael's draft. I learned that four (4) instances out of about 200.000
had more than one Educational category.
There definitely is a demand for a mapping which allows multiple
occurrences, even though there only exist four instances that make use
of it right now. If we go more towards Linked Data we will find
ourselves very often in a situation where the same resource is described
to be used in different educational contexts. With LD this a matter of
building upon already existing metadata, so there should be no
cardinality constraints.
I implemented Mikael's draft some time ago, we needed it for an
EC-funded project where we describe OER (about 10.000 LOs in the context
of organic agriculture and agroecology) with a LOM/LRE AP. Since our
platform stores all metadata i a triple store (with heavy use of named
graphs) we store everything in triples, also the LOM metadata instances.
Mikael's draft was of great help in that matter.
The ARIADNE harvest resulted in around 9 million triples. This number
will increase as I did not have time yet to implement (only partially)
the mapping of the MetaMetadata, Relation and Classification categories.
Currently I am documenting my efforts, I will put a document online soon
and keep you updated.
Best regards,
Hannes
PS: If you are interested, you can have a look at the aforementioned
instances here (they are not necessarily good examples, I just wanted to
show what is "out there" right now):
http://ariadne.cs.kuleuven.be/ariadne-partners/services/oai?verb=GetRecord&identifier=oai:dynamo.asro.kuleuven.be:file8125MD&metadataPrefix=oai_lom
http://ariadne.cs.kuleuven.be/ariadne-partners/services/oai?verb=GetRecord&identifier=oai:dynamo.asro.kuleuven.be:file4446MD&metadataPrefix=oai_lom
http://ariadne.cs.kuleuven.be/ariadne-partners/services/oai?verb=GetRecord&identifier=oai:dynamo.asro.kuleuven.be:file845MD&metadataPrefix=oai_lom
http://ariadne.cs.kuleuven.be/ariadne-partners/services/oai?verb=GetRecord&identifier=oai:dynamo.asro.kuleuven.be:file7908MD&metadataPrefix=oai_lom
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