rdf:Property, reverse mapping, backwards compatibility

The reverse mapping only removes rdf:Property triples in the presence  
of another property typing triple - a declaration, in the same graph.  
This leads to a situation in which an OWL 1 ontology which has x  
rdf:type rdf:property, and  x rdf:type owl:ObjectProperty in the  
imports closure, valid in OWL 1, would be considered syntactically  
invalid in OWL 2.

The repair, I believe,  is to remove those rows that mention  
rdf:Property  the reverse mapping in table 4 and simply say that all  
triples x rdf:type rdf:Propery  are deleted.

-Alan