UCD elements

[Tony Linde]

I agree with Clive. We need some way of saying that version X of registry
uses UCD1 and version X+1 will use UCD2 or whatever. Or each registry says
which versions of individual standards it supports (UCDs, Identifiers, etc).
We certainly shouldn't stuff every variant of every standard into the
metadata.

Tony.

> -----Original Message-----
> From: owner-registry at eso.org [mailto:owner-registry at eso.org] 
> On Behalf Of Clive Page
> Sent: 02 July 2004 09:11
> To: registry at ivoa.net
> Cc: VOTable mailing list
> Subject: Re: UCD elements
> 
> On Thu, 1 Jul 2004, Martin Hill wrote:
> 
> > We will need (at latest when we introduce UCD2 over UCD1+) 
> > simultaneous UCDs of different versions in single metadata 
> documents 
> > (so both older and newer tools can use them).
> 
> Is that really necessary?  As I understand it there is a 
> unique one-to-one mapping from UCD1 to UCD1+, which should be 
> easily encapsulatable in software, or even a Web Service.  
> I'm not sure if that's true too of UCD2, but if it isn't 
> doing conversions is going to be labour-intensive.
> Putting duplicated UCDs of different versions in each data 
> file seems a bit of overkill if that's true.
> 
> 
> --
> Clive Page
> Dept of Physics & Astronomy,
> University of Leicester,
> Leicester, LE1 7RH,  U.K.
>