[Missing Practical Stuff]

[Guy Rixon]

Matthew,

yes there might be overlap with registry. However, registry doesn't yet have
metadata to describe format of available data, only the syntax of a service
interface or the contextual metadata of a data collection. I don't think there
are metadata to say, e.g. "this service emits VOTable/FITS" o

On Wed, 2 Jun 2004, Matthew Graham wrote:

>
> Hi Francois,
>
> > <>    Just to summarize what it is all about:
> > <>
> > <>     Brian's "private" proposal about External Resource, including
> > <>                 Format Mime/types of the Files
> > <>                 computer encoding ....
> > <>
> > <>     Transform encoding / compression
> > <>     File size
> > <>
> > <>     Pointers to real data and "Location" of relevant data in the dataset
> > <
> > <None of the above are to do with modelling data!  Nevertheless they are
> > <important, and I wonder if they would be better 'opened' in the interop group?
> > <Since they seem to be about locating & describing data instances in general?
> > <Some other groups have already considered some of these aspects - such as
> > <Registry and 'pointers'.
> > <
> >
> >   Suppose you use any kind of serialization of Observation + Quantity DMs
> > (VOTable or "standard XML") in order  to describe your Observational data.
> > At some point you have to describe in this serialization where the data
> > really are, what kind of format, if they are compressed or not. Your software
> > will have to take appropriate decisions according to the actual values of
> > these attributes. So of course it has to be there in the data model for
> > description. This does not prevent us to take into account the work done by
> > the other groups.
>
> It strikes me that there is overlap here with the scope of metadata
> that should be in the registry, although it might not necessarily be there
> yet.
>
> 	Cheers,
>
> 	Matthew
>

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