[seek-kr-sms] SMS Partial Design -- Request for Comments
bowers at sdsc.edu
Mon Apr 5 21:32:05 PDT 2004
This makes sense to me: do the metadata "harvesting" first to build the
initial "template" (or as you say, high-level mapping); then let the
data or service provider fill in the additional mapping as needed.
Note also that there may be different types of metadata: EML for
datasets (there are possibly others for datasets, but we seem focused on
EML) and MoML or WSDL for services. Not sure how much can be obtained
from the service ones.
I also wonder if the ontologies are already close to being able to
handle the mapping from the high-level EML. We should look into this.
Rich Williams wrote:
> Good stuff Shawn! Here are a few comments on the registration mapping part,
> mainly to do with EML. I think it's important to leverage the work done on
> EML and integrate it with the semantics. We need to establish a mapping
> between EML and the OWL ontologies and capture the semantics that are
> implicit in EML.
> I think that a lot of the semantic description of the dataset as a whole
> could be derived from the EML metadata, assuming it is reasonably complete.
> For example, information about the spatial and temporal extent of the
> dataset and about the observed taxa should be in the metadata. Then rather
> than handing the user an essentially empty mapping, we will have initialized
> the mapping as far as possible from the EML metadata.
> Given a data set with EML metadata, I see a two-stage semantic registration:
> 1) Automatically create high-level (data set and data table level) RDF
> individuals for an EML-described data set. They will be useful for allowing
> a high level search of a data set, which can be rejected if there's nothing
> of interest in the RDF individuals before the more detailed semantic
> registration is used.
> 2) Create a lower-level semantic registration of individual fields in a data
> table. This will refer to the higher-level EML-based individuals for parts
> of the context that do not change from field to field. When doing a
> semantic query, these individuals will only need to be instantiated and
> queried if thtere is a higher-level match (#1 above).
> Given this, in your document, I think it would make sense to re-order the
> sequence proposed, so that step 6 happens before steps 2-5.
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