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I am building a Extension , ThingTemplate is one of the input parameter of my service.
It's "GetPropertyValues" or "GetPropertyValuesAsMultiRowTable" (Doc: http://support.ptc.com/cs/help/thingworx_hc/thingworx_6.5_hc/index.jspx?id=IteratingThroughaThingsProperties&action=show)