Extracts sameAs links for resources with themselves. Only makes sense when serialization is
configured such that subjects are IRIs and objects are URIs (or vice versa).
Datasets generated by this extractor.
Datasets generated by this extractor. Used for serialization. If a mapping implementation
does not return all datasets it produces, serialization may fail.
The subject URI of the generated triples
A graph holding the extracted data
when extractor needs some finalization
when extractor has a pre-phase