ERROR: unexpected value 'c' for plc4x in http://plc4x.apache.org/plc4x-doap.rdf
ERROR: unexpected value 'c' for plc4x in http://plc4x.apache.org/plc4x-doap.rdf
ERROR: unexpected value 'c++' for plc4x in http://plc4x.apache.org/plc4x-doap.rdf
ERROR: unexpected value 'c++' for plc4x in http://plc4x.apache.org/plc4x-doap.rdf