SPARQL question: get distinct list of datatypes used for literals

Hi there,

maybe sb can tell me if this is still possible: I'd like to fetch all  
datatype URIs used for object literals in a dataset. There is the  
dataset predicate which can be used in filter expressions to filter  
literals to a known datatype like xsd:string: FILTER(datatype(?val) =  
xsd:string).

But can I bind the value to a variable somehow? With a filter it can't  
work (consider FILTER(datatype(?val) = ?dt) where ?val is bound to  
literal values and ?dt should give me the type). I could use property  
functions, but I'd like to stay with SPARQL specs. Maybe there is a  
way to do it I just can't see...

thanks,
AndyL


Web of Data Practitioners Days / Oct 22-23 / Vienna
http://www.webofdata.info
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Dipl.-Ing.(FH) Andreas Langegger
Institute for Applied Knowledge Processing
Johannes Kepler University Linz
A-4040 Linz, Altenberger Straße 69
http://www.langegger.at