Just a few quick comments.
I agree with Maria that the table alias always should be required in order to prevent confusion.
I agree with Yuji that the units of all parameters in the regions ought to be the same - also in order to prevent confusion. Besides, I don't believe that all queries will involve small circles.
And ADQL should be referencing STC version 1.30 at this point. Here is the correct syntax for a (large) circle. The following two strings are equivalent:
Circle FK5 333.817116 55.832959 2.5
Circle J2000 333.817116 55.832959 2.5
And this one is for all practical purposes the same:
Circle ICRS 333.817116 55.832959 2.5
Here is the XML version of this circle:
<?xml version="1.0" encoding="utf-8"?>
<MyRegion xsi:type="STCRegion"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://www.ivoa.net/xml/STC/stc-v1.30.xsd"
xmlns:xlink="http://www.w3.org/1999/xlink"
xsi:schemaLocation="http://www.ivoa.net/xml/STC/stc-v1.30.xsd
http://www.ivoa.net/xml/STC/stc-v1.30.xsd">
<AstroCoordSystem xlink:type="simple"
xlink:href="ivo://STClib/CoordSys#UTC-FK5-TOPO" id="UTC-FK5-TOPO"/>
<Circle coord_system_id="UTC-FK5-TOPO">
<Center unit="deg">
<C1>333.817116</C1>
<C2>55.832959</C2>
Of course, a more consistent use of STC would be to use the SearchLocation element defined in the schema...
Cheers,
Maria A. Nieto-Santisteban wrote:
> Dear all, > > yet another unfinished version of the ADQL spec has been uploaded to the > the twiki > > http://www.ivoa.net/twiki/bin/view/IVOA/InterOpMay2006VOQL > > See you soon > > M. > -------------------------------------------------------------------------- Arnold H. Rots Chandra X-ray Science Center Smithsonian Astrophysical Observatory tel: +1 617 496 7701 60 Garden Street, MS 67 fax: +1 617 495 7356 Cambridge, MA 02138 arots-at-head.cfa.harvard.edu USA http://hea-www.harvard.edu/~arots/ --------------------------------------------------------------------------Received on 2006-05-09Z21:34:11