Dear All,
At the IVOA meeting at Cambridge Jonathan McDowell asked me to
get some discussion going on possible ways of representing transformations
within the IVOA data model. I made an early attempt, focussing on the use
of transformations to represent WCS information. This failed to raise much
response, other than Doug Tody saying that the FITS-WCS papers supply
everything we need. However, given that the next IVOA meeting is not far off,
I thought I should have another bash. So I've produced a document giving
an outline of an AST-like approach to the representation of
transformations (i.e. Mappings - no Frames) which I intend to advertise on
the IVOA mailing lists. It's at:
http://www.ast.man.ac.uk/~dsb/ivoa/VOMapping.html
I would welcome any comments (ASAP) before I make it public. Not so much
on the detail, so much as on the overall approach. For instance, I've not
included any formal definitions, either as XML schemas, or RDF, or
anything else. Neither have I spent much time on the issue of how and
where these transformations could be used within the IVOA data model.
David
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