Pune meeting

[Sebastien Derriere]

"Patricio F. Ortiz" wrote:
> 
> > - identifiers changed (start with ivo:// and ':' replaced by '/'). e.g.:
> >    oai:CDS/VizieR:J/ApJ/481/95/table2 becomes
> > ivo://CDS/VizieR/J/ApJ/481/95/table2
> 
> I kind of liked the previous approach, in table names which do not contain
> slashes the separator if perfectly visible, but in the case of vizier, it
> gets lost among 6 slashes!

  Well, if I refer to the PR for Identifiers:
http://www.ivoa.net/Documents/PR/Identifiers/Identifiers-20040621.html
  it says about the Resource Key that:

 it must not contain any of the other reserved characters, ";", ":",
"@", "?", "#", ",", "[", "]", "<", ">".

  So I had to remove the ':' to make it compliant !

> >       o content/subject (split in individual subjects)
> 
>         Is the subject inherited from the keywords?

  Yes, exactly. These are the keywords.

> A couple of extra things. I may be missing a point here, but your shortname
> seems a bit too short in the case of your example table (J/ApJ/481/95/tab),
> yet it is correct for other catalogues (eg VII/188/table1) Is this a
> limitation on the number of characters accepted in shortname? If so, what
> is the envisioned use of shortname if it can not be unique. In your
> example, table2 and table3 have the same shortname.

  There is a 16-char length restriction on 'shortname' imposed in the
schema.
So I basically only kept a substring of the automatically-generated
shortname.

> Another point is the usage of double quotes in the units of RA and Dec when
> quoted in h:m:s, d:m:s. I would think that we should get rid of the quotes
> in the units.

  Why not, if there is an agreement on this?

> And talking about wish lists, should we try to incorporate the knowledge of
> wether a quantity is measured linearly or logarithmically at this level of
> registry and not having to deduced it by guessing its range or a
> hint in the column description or a guesstimate based on column name?
> It is when one tries to combine quantities when these pieces of metadata
> come particularly handy!

  You probably know the convention in VizieR: this is expressed in the
unit. If a unit is in brackets, it is a logarithm. e.g. [K] means 'log
of Kelvins'.
  In fact, you need it when you combine different quantities, and you
also need the units (and possibly the semantics) so this sounds
reasonnable. 
  I guess this discussion goes beyond the registry group... this
concerns
ADQL, UCD and applications at least.

Sebastien.
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