IETF MediaCtrl MRB 1.0 This is the schema of the IETF MediaCtrl MRB Consumer interface. The schema namespace is urn:ietf:params:xml:ns:mrb-consumer This import brings in the XML attributes for xml:base, xml:lang, etc This import brings in the civicAddress specification from RFC5139. This type is extended by other (non-mixed) component types to allow attributes from other namespaces.