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Describing SSA services as a VO resource

Part 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 Schemas

Two working draft versions are currently available.

SSA-wd.xsd
This is the version for Working Group discussion.
an example

SSA-v0.1.xsd
This is a working draft version for current use in the Registry.
an example

The reason for two versions is that there are several issues regarding details of the schema represented in SSA-wd.xsd that still need to be discussed and worked out. However, there is demand to represent current SSA implementations in the registry ASAP; thus, SSA-v0.1.xsd represents an interim schema that is to be adopted right away. WG approval of this interim schema will be sought at the Fall 2007 Interop in Cambridge.

Representing v1.0 and pre-1.0 implementations

One 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.

VOResource 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


Topic attachments
I Attachment Action Size Date Who Comment
Unknown file formatxsd SSA-v0.1.xsd manage 20.3 K 2007-09-24 - 15:05 RayPlante  
Unknown file formatxsd SSA-wd.xsd manage 25.1 K 2007-09-24 - 15:06 RayPlante  
XMLxml ssa.xml manage 5.8 K 2007-09-27 - 09:41 RayPlante  
XMLxml ssavor.xml manage 7.4 K 2007-09-27 - 09:40 RayPlante  
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Topic revision: r3 - 2007-09-27 - RayPlante
 
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