Expressing position in RDF
ael13 at leicester.ac.uk
Tue Oct 14 01:17:45 PDT 2008
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.
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
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.
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"?
> 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
>> geo:hasCoordinate :myRA.
>> :MyRA a a:rightAscension;
>> q:hasFloat 34.5343^^xsd:float;
>> q:hasUnits ui:degree.
More information about the semantics