The freeClass Ontology for construction and building materials and services http://www.freeclass.eu/freeclass_v1 http://www.freeclass.eu/freeclass_v1# http://www.freeclass.eu/freeclass_v1#C_A1-gen http://www.freeclass.eu/freeclass_v1#C_A1-tax http://www.freeclass.eu/freeclass_v1#P_E60 http://www.freeclass.eu/freeclass_v1#P_E78 http://www.freeclass.eu/freeclass_v1#V_1 http://www.freeclass.eu/freeclass_v1.owl 2010-02-22T14:55:00+01:00 monthly