Expressing position in RDF

[Roy Williams]

Matthew

I like Doug's question, asking how the RDF will be used: produced, 
presented, stored etc. Another question in the same genre asks what 
*queries* will run against this knowledge base. I suspect that "RA" will 
be used in an arithmetical inequality -- "Give me all sources with 
RA>240.0", also as part of a cone search or polygon. Is it Sparql, the 
query language for RDF? How would an inequality be framed as part of a 
Sparql query?

More abstract, we could utilize RDF at a higher level -- not details of 
coordinate systems, as in this naked quantity "RA". How about the RDF 
handles "Regions" (of spacetime). With Regions, the questions are no 
longer arithmetical, but rather boolean choices, about intersection: 
"Does the Region in which this event lies intersect with the spacetime 
coverage Region of the Catalina Survey?"

Roy


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California Institute of Technology
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