http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://www.disit.org/km4city/schema#DeviceAttribute http://www.disit.org/km4city/schema#data_type string http://www.disit.org/km4city/schema#value_type http://www.disit.org/km4city/resource/value_type/sunset_time http://www.disit.org/km4city/schema#value_name sunset http://www.disit.org/km4city/schema#value_unit http://www.disit.org/km4city/schema#value_refresh_rate 10800 http://www.disit.org/km4city/schema#healthiness_criteria refresh_rate