Data and services
dtody at nrao.edu
Fri Sep 12 11:04:23 PDT 2003
On Fri, 12 Sep 2003, Tony Linde wrote:
> Can I suggest some naming rules (bit rich since I'm not an astronomer) to
> avoid confusion.
> Everything referred to by a registry entry is a resource, uniquely and
> globally identified by a ResourceId.
Yes - registries register resources, which should include both services
and data (and possibly other things).
> A service is anything which is invocable, ie is a web service with callable
> A data collection is any set of data which can be queried.
A data collection is a logically-related grouping of datasets.
> A sky service is a service which provides access to a data collection.
I think we should omit this term - it belongs in the application domain.
That is, a service implementor might define something they call a sky
service (or many other types of services) but these are not registry
concepts. The registry will be used to register such services, but it
doesn't "know" about them.
> A dataset is any addressable part of a data collection. Access to the
> dataset is via the sky service of the data collection.
The first statement is ok. More formally a dataset is a structured
data object which we treat as a unit in terms of data management, e.g.,
a FITS image.
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