[QUAR] Re: Expressing position in RDF

[Norman Gray]

Roy,

On 2008 Oct 16, at 21:57, Roy Williams wrote:

>> Do we have a FITS ontology then that we can reference? Otherwise  
>> all we have is a set of keyword names.
>
> It has been advocated in the past that the VO registry be used for  
> FITS vocabularies. Each project that produces a collection of FITS  
> files makes up some new keywords, and often explains them on a web  
> page. We could collect and store this information in a formal way  
> with the registry, and suggest that each FITS collection insert a  
> keyword like "IVORN = ivo://mysurvey.org/fits" to allow people to  
> access registyr data and thus get deeper explanation of the keywords  
> than can be provided in the 50-character comment area of the FITS  
> card-image.

Up to a point.  Probably simpler is to encourage each collection to  
list its keywords as an RDFSchema (of the simple format in my previous  
message), and put that file at a published *HTTP* URI using the  
current Best Practice techniques for doing that.  That makes it very  
easy to retrieve.

Having formal names for each of the properties/keywords in the  
project's set gives a well-defined start and end point for mappings  
between the properties, and disambiguates them usefully.

(SKOS-type vocabularies would not be appropriate here)

All the best,

Norman


-- 
Norman Gray  :  http://nxg.me.uk
Dept Physics and Astronomy, University of Leicester