Expressing position in RDF

[Linde, A.E.]

I suspect any of the RDFizers would do just that.

We need to ask if the more verbose statements provide any more *useful* information or if the terser statement loses some.

T.

-----Original Message-----
From: Matthew Graham <mjg at cacr.caltech.edu>
Sent: 14 October 2008 08:03
To: Rob Seaman <seaman at noao.edu>
Cc: IVOA semantics <semantics at ivoa.net>
Subject: Re: Expressing position in RDF


Hi,

Although this works, it is very verbose for such a simple (!)
statement. To sell this sort of stuff to end users, we really need a
practical and succinct set of object properties that would allow me
just to do:

:MyObject a:rightAscension 134.556^^xsd:float

After all anything observable in the sky has a RA.

        Cheers,

        Matthew


On Oct 13, 2008, at 11:50 PM, Rob Seaman wrote:

> Like I said:
>
>> don't you really want to represent something like "object has a
>> WCS" and "the object's WCS corresponds to an RA of 134.556"?
>
> :-)
>
> Rob
> ---
>
> Matthew Graham wrote:
>
>>> I want to represent the relationship "object has a RA of 134.556"
>>> as an RDF triple. Is there any existing ontology that would allow
>>> me to do this?
>
> On Oct 13, 2008, at 7:24 PM, Ed Shaya wrote:
>
>> Here is "MyStar has a J2000 RA of 34.5343 degrees, it would be
>> something like this in N3:
>>
>> :MyStar a a:star;
>>    ivoa:hasPosition :MyCoordinates.
>>
>> :MyCoordinates a
>> a:J2000Coordinates
>> ;
>> geo:hasCoordinate :myRA.
>>
>> :MyRA a a:rightAscension;
>>   q:hasFloat 34.5343^^xsd:float;
>>   q:hasUnits ui:degree.
>
> ...
>