how to make a publisherDID
patrick.dowler at nrc-cnrc.gc.ca
Tue Oct 25 12:44:44 PDT 2011
I need to decide on a procedure for making publisherDID values for use in TAP
services, for example in the ivoa.ObsCore table, but also our internal CAOM
tables which also expose the same identifiers. This is following from the
interesting DAL-DM-DCP discussions on use of URIs.
Presumably, I could start with a DataCollection identifier registered in the
IVOA registry system, eg:
(note: more generally, a creatorDID would be linked to a DataCollection and a
publisherDID might be linked to a provider/service in case they are not the
same or definitive provider - let's ignore that for now)
In the past we would use the fragment, eg
ivo://cadc.nrc.ca/archive/cfht#12345/raw but that implies that one can somehow
"get" the entire collection and then look for "12345/raw" inside it (client
Instead, I could append some dataset-specific to get an observation identifier,
and then append something product-specific to get an identifier for the product,
However, if someone has one of these (the last one), what can they do with it?
With this approach, there is no prescribed way to extract the identifier for
the registered DataCollection. Should there be?
In VOSpace, the spec invents a new URI scheme (vos) that prescribes exactly
how to extract/create the service URI from the vos URI, but it comes down to
being able to separate the URI into two halves: a base that can be looked up
in a registry and a separate bit (path in vos) that can be used when talking
to the service. In principle this does not require a new scheme, but it does
require at least a way to separate.
PS-I have the exact same issue with several services where I want to identify
the service with an ivo URI and I want to make and use URIs for items found
within/via that service.
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