Start to drop the UNOFFICIAL namespace
allow rdf:Literal as range for literals, DM2E/dm2e-mappings#60
1.1_Rev1.5: bibo:numPages rdfs:range (xsd:unsignedInt | rdf:Literal),
DM2E/dm2e-mappings#60
sledgehammer solution to DM2E/dm2e-mappings#60 1)