Re: [Virtuoso-users] constructing URI's from literals

[Peter A. <p_a...@ya...>]

Hi Ivan,

Is there any way to perform a percent-encoded operation on the strings which are being used to create the IRI's so that I can get a practical guarantee that errors won't occur?

Ie, I want to do this

`iri(bif:concat("http://bio2rdf.org/flybase:",bif:percent_encode(?o)))`


I also want a version where spaces are %20 encoded, and not + encoded as in some URL encoding schemes.

Cheers,

Peter



----- Original Message ----
> From: Ivan Mikhailov <imi...@op...>
> To: Peter Ansell <p_a...@ya...>
> Cc: Virtuoso Users List <vir...@li...>
> Sent: Monday, 16 February, 2009 10:04:08 PM
> Subject: Re: [Virtuoso-users] constructing URI's from literals
> 
> Hello Peter,
> 
> > Is there anyway with SPARQL and Virtuoso to create a URI in a result when it 
> is stored as a literal in the triplestore?
> 
> 
> Virtuoso has built-in function iri() that is similar to str() but
> produce an IRI.
> 
> > An example query of the relevant data is:
> > 
> > SELECT * WHERE { GRAPH{ ?s ?p 
> "http://purl.org/obo/owl/COG#COG_C"^^xsd:anyURI . } }
> > Endpoint: http://sparql.neurocommons.org/sparql/
> 
> SELECT ?s (iri(?o)) as ?o_iri
> WHERE { GRAPH{ ?s
> ?o } }
> 
> 
> It's easy to make some transformation of the IRI, like
> 
> SELECT
> ?s
> (iri(bif:sprintf("http:/myproxyserver.private/describe?iri=%U",
> str(?o)))) as ?o_iri
> WHERE { GRAPH{ ?s
> ?o } }
> 
> or, slightly better,
> 
> SELECT
> ?s
> (bif:sprintf_iri("http:/myproxyserver.private/describe?iri=%U",
> str(?o))) as ?o_iri
> WHERE { GRAPH{ ?s
> ?o } }
> 
> 
> You may use "backquoted" calculated expressions as triple pattern
> fields...
> 
> SELECT ?s (iri(?o)) as ?o_iri
> WHERE { GRAPH `iri(bif:concat("http://purl.org/science/graph/",
> "obo/COG2GO"))` { ?s
> ?o } }
> 
> ... or as triple construct fields:
> 
> construct {
> ?s 
> `bif:sprintf_iri("http:/myproxyserver.private/describe?iri=%U",
> str(?o))` }
> WHERE { GRAPH{ ?s
> ?o } }
> 
> Best Regards,
> 
> Ivan Mikhailov
> OpenLink Software
> http://virtuoso.openlinksw.com



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