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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	So, Hotmail "solves" this problem by disallowing many types of attachments.
http://www.w3.org/ns/prov#wasQuotedFrom	ask-leo.com