has publication date The date on which a resource is published or disclosed. The date can be expressed in three different formats: - yyyy-mm-dd (i.e., xsd:date) - yyyy-mm (i.e., xsd:gYearMonth) - yyyy (i.e., xsd:gYear) :my-paperback a fabio:Paperback ; prism:publicationDate '2007-06'^^xsd:gYearMonth .