http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.disit.org/km4city/schema#CustomAttribute
http://www.disit.org/km4city/schema#data_type
string
http://www.disit.org/km4city/schema#value_name
weatherForecast-099h
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
any