SimpleDALRegExt1.2 Proposed Recommendation: Request for Comments

The latest version of SimpleDALRegExt 1.2 can be found at:

• https://ivoa.net/documents/SimpleDALRegExt/20201216/index.html

Summary

SimpleDALRegExt defines a group of registry extensions for describing related "Simple" DAL services: Cone, Image, Spectra, etc. Occasional tweaks to vocabularies and incremental changes to the services' own standards are tracked here to keep potential registry search results in line with actual service capabilities, and to show connections between resources in new ways: in this case, adding auxiliary capability descriptions (see below.)

Changes since 1.1

Most of the document is unmodified. Some vocabulary cruft has been removed and tested with searches across all current registries to assure backward compatibility.

There are three changes which should be reviewed:

• Section 4, the auxiliary capabilities. Introducing these has been the original motivation for building SRE 1.2.
• SSAP services can declare which reference frames they support in POS. So far, there has been a list of those in the schema. We now point to a vocabulary developed in the run-up to MCT, http://www.ivoa.net/rdf/refframe/. Accepting this as REC would also make this vocabulary accepted.
• SSAP services can now declare a productType (sect. 3.3.3). This is to support the growing number of SSAP services publishing time series, but the vocabulary is also intended for re-use in Obscore (from where it comes). Accepting this as REC would also make the vocabulary http://www.ivoa.net/rdf/product-type accepted.

Reference Interoperable Implementations

The auxiliary capabilities for the S-Protocols are a consequence of the Endorsed Note on discovering data collections. Compared to TAP auxiliary capabilities, they have not been used much yet (there are ivo://org.gavo.dc/lensunion/q/im and ivo://org.gavo.dc/hppunion/q/im, though). Hence, to our knowledge there is no client takeup of them. Consider this change editorial in nature; the standards identifiers from discovering data collections simply needed to be mentioned in this spec.

Similarly, using a vocabulary for the reference frames rather than an in-schema list is just intended to cut down on the number of lists of reference frames in the various standards. It has no operational implications (even less so since to date few services or clients actually offer different reference systems in SSAP queries).

The declaration of product type, on the other hand, has operational consequences; several services in the VO already declare their product type; try

Comments from the IVOA Community during RFC/TCG review period: 2021-03-01 to 2021-04-23

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Comments from TCG member during the RFC/TCG Review Period: 2021-03-01 to 2021-04-23

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