_:vb915882 . _:vb915882 . _:vb915882 . _:vb915882 "http://www.w3.org/TR/2013/REC-prov-dm-20130430/#term-collection" . _:vb915882 . _:vb915882 "A collection is an entity that provides a structure to some constituents, which are themselves entities. These constituents are said to be member of the collections." .