Multiple mappings results in duplicated rdf:type triples

[Abbe98]

Example:

wdt:P6 a owl:ObjectProperty ;
	owl:equivalentProperty <http://www.cidoc-crm.org/cidoc-crm/P46_is_composed_of> ;
	a owl:ObjectProperty ;
	owl:equivalentProperty <https://schema.org/isPartOf> ;
	a owl:ObjectProperty ;
	owl:equivalentProperty <https://www.wikidata.org/entity/P361> .

But because Wikibase already sets wdt:P6 a owl:ObjectProperty elsewhere, the following would be expected:

wdt:P6 owl:equivalentProperty <http://www.cidoc-crm.org/cidoc-crm/P46_is_composed_of> ;
	owl:equivalentProperty <https://schema.org/isPartOf> ;
	owl:equivalentProperty <https://www.wikidata.org/entity/P361> .