UCD elements

[Marco C. Leoni]

Hi Tony,
    I think the services should say the UCDs version they are using or 
can understand/support: the registry - as a service itself - will 
specify the UCD version used to create the metadata describing itself.


Cheers,
    Marco



Tony Linde wrote:

>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: 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.
>>