More VOTable 1.2 points
m.b.taylor at bristol.ac.uk
Tue Mar 3 09:15:32 PST 2009
Francois and others,
I have some additional points to make about the VOTable 1.2 document.
Examining the VOTable 1.1 and 1.2 schemas, I have found a few
differences which are not documented in Section 8 "Differences between
versions 1.1 and 1.2":
1. The VOTABLE and RESOURCE elements now permit a GROUP to appear as
a direct child. This is probably reasonable in order to group
PARAMs which are already permitted there, but this change should
be documented in section 8.
2. The TABLE element now permits multiple DATA elements.
I can't see this is a good idea - I presume it's a mistake
in the schema. Should be corrected.
3. The TR element has acquired an ID attribute. A comment in the
"The ID attribute is added here to the TR tag to avoid
problems of code generators which do not properly
interpret the TR/TD structures"
I am not very keen on introducing otherwise unwanted features in
a schema to pander to the vagaries of poorly written third
party code. There should at least be a debate about whether
this is a distasteful but pragmatic necessity for the VOTable
schema, or whether it should be the responsibility of those
using code generators to work round said problems (I'm not
sufficiently knowledgeable about the use of code generation
to have a firm opinion, though I can supply prejudices on
At the very least, if this attribute is introduced, it must be
documented in section 8.
There is also another item I've just noticed, which it seems was
introduced in the 1.1 schema:
4. The TD element has an "encodingType" attribute. This seems to be
related to the idea proposed in Appendix A.5 "Encoding individual
table cells". That appendix describes an idea which was discussed
but never agreed for introduction into the standard. Nowhere in
the body of the document is the meaning of this attribute for a
TD mentioned. I therefore believe it should never have been
introduced, and should be removed.
Mark Taylor Astronomical Programmer Physics, Bristol University, UK
m.b.taylor at bris.ac.uk +44-117-928-8776 http://www.star.bris.ac.uk/~mbt/
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