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Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	You should not need a preview app, PDF or image files should just present to any app capable of showing them, including PDF Pen, PDF Pro, and iBooks.
http://www.w3.org/ns/prov#wasQuotedFrom	imore.com