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<p style="margin-bottom: 0in; line-height: 100%">Dear IVOA members
!</p>
<p style="margin-bottom: 0in; line-height: 100%">Following the
last
IVOA meeting and about the new ADQL version.</p>
<p style="margin-bottom: 0in; line-height: 100%"><br>
</p>
<p style="margin-bottom: 0in; line-height: 100%">Coordinate System
had been deprecated from the ADQL region. This capability was
may be
not very used, and was may be ambiguous. However to change the
coordinate system was used in VizieR. </p>
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<p style="margin-bottom: 0in; line-height: 100%">Moreover, there
is
not today a pivot coordinate system used for all tables in all
data-centers. I am agree that coordinate System could be an
option,
but in my opinion, to remove it without any alternatives will
impoverish ADQL.</p>
<p style="margin-bottom: 0in; line-height: 100%"><br>
</p>
<p style="margin-bottom: 0in; line-height: 100%">If coordinate
system
in option is rejected, we could also add a function such as the
function proposed by Markus in Gavo to make possible the change
of
coordinate System:<br>
</p>
<p style="margin-bottom: 0in; line-height: 100%">gavo_transform(from_sys
TEXT, to_sys TEXT, geo GEOMETRY) -> GEOMETRY <br>
</p>
<p style="margin-bottom: 0in; line-height: 100%"><br>
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<p style="margin-bottom: 0in; line-height: 100%">So, I ask IVOA
people to consider this capability as a ADQL standard (as a
function
- may be optional).</p>
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<p style="margin-bottom: 0in; line-height: 100%">Regards,</p>
<p style="margin-bottom: 0in; line-height: 100%">Gilles Landais
(CDS)<br>
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