Describing SSA services as a VO resourcePart of the standardization of a protocol is defining an XML schema for describing an instance of the service, primarily in a VO registry. This is done by creating an extension of the VOResource schema.Working Draft SchemasTwo working draft versions are currently available.
SSA Extension metadataHere is a list of the extension metadata that can be included in an SSA schema:
| |||||||||
Changed: | |||||||||
< < | Allowed values are "minimal", "query", and "full". (See schema for definitions of values.) | ||||||||
> > | Allowed values are "query", "minimal", and "full": | ||||||||
Added: | |||||||||
> > |
| ||||||||
testQuery item above.
Representing v1.0 and pre-1.0 implementationsOne important issue we need to address is how to support the earliest SSA implementations. These were built well before v1.0 of the SSA spec was completed; thus, it is unlikely that they would be compliant at this time. Still, several do exist, and it would be good to recognize these as serving spectra. The subsection below gives a proposal for representing the pre-v1.0 services with a special version value on the interface. However, the editor of the SSA spec voiced a preference for labelling pre-v1.0 implementations using a different capabilityxsi:type , and there were no dissents. Thus, in the new schema above, there is a second capability type (defined identically to the first one) called "ProtoSpectralAccess" (as oppsed to "SimpleSpectralAccess" ).
Previous version proposalVOResource v1.0 allows one to list in one resource description support for different versions of a protocol. For SSA, this means that within the "SimpleSpectralAccess" capability element, multiple interface elements may be listed, each with a different value for its version attribute. (If version is not provided, "1.0" is to be assumed.) I recommend that we encourage the registration of the early SSA services using the "SimpleSpectralAccess" capability but to set the value of the interface element to "proto". That is,<ri:Resource ...> ... <capability xsi:type="ssa:SimpleSpectralAccess"> <interface xsi:type="vs:ParamHTTP" version="proto"> <accessURL> ... </accessURL> </interface> ... <capability> ... </ri:Resource>(If you don't "proto" as a version string, please suggest an alternative, e.g "0.5".) -- RayPlante - 24 Sep 2007 <--
|