UCD elements

[Guy Rixon]

Hmmm, namespaces...

If we have a format that includes <UCD> meaning UCD 1 and later it evolves
into somthing where <UCD> means UCD 1+ (VOTable 1.0 -> 1.1?) then the new
format desperately needs a new namespace URI.  Therefore we'd have <old:UCD>
and <new:UCD> distinguished by the namespaces and there shouldn't be a
problem.  If you want to accept UCD 1 and UCD 1+ in the same XML vocabulary,
then you need <UCD version="...">

BTW, we _do_ have different namespace URIs for VOTable 1.0 and VOTable 1.1,
don't we?

On Thu, 1 Jul 2004, Martin Hill wrote:

> At the moment we have an element called <UCD> that contains UCD v1 values.  We
> are now talking about UCD1+ which are different; what element name should we use
> for these?  <UCD_PLUS> ?
>
> It would be Bad to use the same element, as the values are really of different
> types (and so interpreting it will be ambiguous).  However we might be able to
> get away with it this once as it is still early days, and I gather no-one has
> data lying around in VO formats that they intend to keep for long!
>
> Cheers,
>
> Martin
>
> --
> Martin Hill
> www.mchill.net
> +44 7901 55 24 66
>
>

Guy Rixon 				        gtr at ast.cam.ac.uk
Institute of Astronomy   	                Tel: +44-1223-337542
Madingley Road, Cambridge, UK, CB3 0HA		Fax: +44-1223-337523