separating TAP and query languages
roy at cacr.caltech.edu
Mon Feb 23 07:37:23 PST 2009
> How do you know that these things cost "years of effort"? Have you
> spent years implementing them?
I'm thinking of ADQL. Years to *robust* implementation (not just
prototype). I think of 3-page ADQL expressions full of variable names
and metadata. Getting the types and metadata right between SQLServer and
ADQL. Proper error returns that tell the user how to fix it, rather than
just NullPointerException. A REGION with a thousand holes intersecting
one with a million holes. All the SOAP and VOSI and authentication and
service logs to deal with. Documentation that you can read at different
levels. To a data provider, implementing the ADQL monolith is VERY
complex and needs weeks just to understand the dozen required documents.
The point of the Multicone service is that you*don't* need to do ADQL!
The point is that it gets 90% of what the astronomer wants for 10% of
the effort! And it can be made robust as well.
California Institute of Technology
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