(no subject)

<francois-at-vizir.u-strasbg.fr>,<Inaki.Ortiz-at-sciops.esa.int>, <Aurelien.Stebe-at-sciops.esa.int>,<dm-at-ivoa.net> Sender: owner-voql-at-eso.org
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Reply-To: voql-at-ivoa.net

 Pedro:
 It looks like you also have an SQL schema for the registry.  Can you send it to me (I think Maria may want to see it as well).  There are some details (like the vertex list, and some of the datatypes) that I could not get from the XML.  I find the schema much more compact than the XSD or the UML

    (and much more complete than the UML which focus on relationships and names).
 Thanks!
 Jim

-----Original Message-----
From: owner-voql-at-eso.org [mailto:owner-voql-at-eso.org] On Behalf Of Pedro Osuna
Sent: Wednesday, December 21, 2005 2:55 AM To: Maria A. Nieto-Santisteban
Cc: Pedro.Osuna-at-esa.int; Francois Ochsenbein; Inaki.Ortiz-at-sciops.esa.int; Aurelien.Stebe-at-sciops.esa.int; voql-at-ivoa.net; dm-at-ivoa.net
Subject: Re: Collaboration on Source Catalogue DM, ADQL and SkyNodes

Hi Maria,

> - How does Catalogue Data Model used look like, especially what is the
> common set of attributes and the associated metadata.

The point is in the (Source) Catalogue Data Model, with emphasis in the "Source" part. This one is the one I showed on behalf of the Catalogue DM subgroup at our last interop meeting here at ESAC. I attach a pdf with the initial proposal, but please use it only for temporal reference, as the whole document will be changed (according to requirements from Jonathan after the interop meeting).

> - What are the plans about registration? Will these nodes (Basic?) be
> registered and therefore accessible through Open SkyQuery? How many?

yes, they will. How many, I don't know. In Strasbourg, Inaki and Aurelien worked on a couple of them, Tycho-2 and USNOB, but the CDS colleagues will work on more.... Francois will answer to this question at some point I presume.

> - The cross-match functionallity. Are you planning on a 2 catalog
>cross-match or n-catalog cross-match? How does the cross-match function

>look like?

n-catalogue cross-match is what we are trying to get at; it will be a client based cross-match, and therefore the cross-match function will be designed and run at the client side (i.e., servers do not need to worry about implementing one specific cross-match or the other). At the current status, the client sends an ADQL to the server to discern which type of cross-match it can do with it (whether only positional, positional with errors, etc.), and takes the corresponding action.

I hope this clarifies your questions. We wanted to let you all know even at this preliminary stage, to open fruitful interactions. We will get in touch in a near future with more details on how we are evolving.

Cheers,
P.  

On Wed, 2005-12-21 at 05:13 -0500, Maria A. Nieto-Santisteban wrote:
> Hi,
>
> This is great news!
>
> There are three things I would be interested in knowing:
>
> - How does Catalogue Data Model used look like, especially what is
> the common set of attributes and the associated metadata.
>
> - What are the plans about registration? Will these nodes (Basic?) be
> registered and therefore accessible through Open SkyQuery? How many?
>
> - The cross-match functionallity. Are you planning on a 2 catalog
> cross-match or n-catalog cross-match? How does the cross-match
> function look like?
>
> Cheers
>
> Maria
>
> On Wed, 21 Dec 2005, Pedro Osuna wrote:
>
> > Dear all,
> >
> >
> > Within the Data Model and ADQL context, ESAVO has initiated a
> > collaboration with CDS in order to try to find a reference
> > implementation for the usage of the Source Catalogue Data Model
> > together with ADQL.
> >
> > The effort consists on setting up servers that understand ADQL on
> > Source Catalogue Data Model aware Basic SkyNodes.
> >
> > We have set up such servers for our ISO and XMM source catalogues
> > here at ESAC, and Inaki Ortiz and Aurelien Stebe have spent a week
> > in Strasbourg collaborating with our CDS colleagues, Andre Schaaf et

> > al., in the building of such Basic SkyNodes for some of their
catalogues.
> >
> > Once those servers are available, the idea is to use the Source
> > Catalogue Data Model aware server to implement a client-side
> > cross-match using ADQL, as a proof-of-concept of the validity or
> > otherwise of the model. ESAVO is developing a simple client to try
the concept.
> >
> > Should you want more information on how we have done the translation

> > from the Catalogues to a Source DM aware Basic SkyNode, or on any of

> > the aforementioned subjects, please do not hesitate to ask.
> >
> > Best regards,
> > Pedro Osuna (ESAVO) and Francois Ochsenbein (CDS)
> >
>

--
Pedro Osuna Alcalaya

ESA
Science Archives System Engineer
Science Archive Team
European Space Astronomy Centre
(ESAC/ESA)
e-mail: Pedro.Osuna-at-esa.int
Tel + 34 91 8131314
---------------------------------

European Space Astronomy Centre
European Space Agency
P.O. Box 50727
E-28080 Villafranca del Castillo
MADRID - SPAIN