SAREF now includes the saref:PropertyValue class to represent property values. PROPOSAL: * To replace s4grid:PropertyValue with saref:PropertyValue. * To replace s4grid:hasValue with saref:hasValue. * To replace s4grid:hasUnit with saref:isMeasuredIn. * To replace s4grid:hasPropertyValue with saref:hasPropertyValue. * To replace s4grid:hasProperty with saref:isValueOfProperty. Changes have to be performed in the OWL code, TS, diagrams, documentation and examples.