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openRDF.org Forum » AliBaba & Elmo: Help » Thread: string-typed literals and Elmo

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Jan 31, 2008 9:08:20 PM

josh
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Joined: Jun 13, 2007
Posts: 3
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string-typed literals and Elmo

Hello. I'd like to know if it's possible to have Elmo create string-typed literals instead of plain literals. For instance, this interface has a "set" method which takes a String as an argument:

@rdf("http://www.example.com/onto#SomeClass")
public interface SomeClass {
    @rdf("http://www.example.com/onto#stringTypedProperty")
    String getStringTypedProperty();
    void setStringTypedProperty(String value);
}

Supposing that the domain of stringTypedProperty is xsd:string, the objects of the statements created by setStringTypedProperty must (in my application) have a datatype of xsd:string. I notice that the org.openrdf.elmo.literals file included with Elmo does map java.lang.String to xsd:string, and I've even tried adding the association programmatically using ElmoModule.recordLiteral, yet I only manage to get plain literals for Strings. Is there anything I've overlooked?

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Feb 1, 2008 5:33:09 PM

james
OpenRDF.org Consultant

Canada
Joined: Jul 21, 2005
Posts: 650
Status: Offline

Re: string-typed literals and Elmo

There is no way to override that behaviour through resources files. You will have to override the behaviour in Java.

All String are converted into Literals using the ValueFactory#createLiteral(String) method, which is called from the SesameLiteralManager#getLiteral(Object)

For each SesameManager, create a LiteralManager wrapper around the one returned by SesameManagerFactory and override the getLiteral(Object) method.

http://www.openrdf.org/doc/elmo/1.0-beta2/apidocs/org/openrdf/elmo/sesame/SesameManagerFactory.html
http://www.openrdf.org/doc/elmo/1.0-beta2/apidocs/org/openrdf/elmo/sesame/SesameManager.html
----------------------------------------
Sesame Consultant
http://leighnet.ca
http://jamesrdf.blogspot.com

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