handling metadata with multiple values

[Doug Mink]

Anita Richards wrote:
> 
> Ah - in the AstroGrid Registry group we came to the opposite conclusion -
> that for human maintenance of the registry entries for data sets, at
> least, it was easier for lists to be in container elements as it makes it
> much easier to see (in a properly indented document) where one
> type of element ends and the next begins.
> There are some exceptions at present for 'very important' elements with
> short lists.
> 
> However you can call the items something more informative, for example
> 
> <ucdList>
>   <ucd></ucd>
>   <ucd></ucd>
>   <ucd></ucd>
>   <ucd></ucd>
> </ucdList>

If there is only one item, would it be simply

<ucd></ucd>

or would it be

<ucdList>
  <ucd></ucd>
</ucdList>

If I'm querying <ucd>, would the server know to search for the tag inside
<ucdList>, too, or would I have to ask for both <ucdList> and <ucd>?
Would the standard predict which tags could have multiple values and
be turned into <tagList></tagList>?

-Doug Mink