Updated API with the PropertyValueSet methods

Hi,

As I promised during today's conference call I have updated the Java API
prototype to include the getPropertyValueSet methods ... [1]

Best Regards

[1]
http://www.w3.org/2005/MWI/DDWG/drafts/api/java/DDR-API-Minimal/doc/org/w3c/ddr/core/DDR.html

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José Manuel Cantera Fonseca
Telefónica I+D