PropertyValue
http://www.w3.org/1999/02/22-rdf-syntax-ns#type
http://www.w3.org/ns/prov#value
  • If it makes it easier, you could change your classification to publication_type (I am assuming that you have a separate table to tabulate publication information such as date published, publisher, edition, journal, etc., since it is possible that a single article/report could be published in multiple journals, or that a listed publisher changes between editions.), and publication_type would lend
http://www.w3.org/ns/prov#wasQuotedFrom
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