| http://www.w3.org/ns/prov#value | - ciated with the message, such as the message subject, body, date/time, the presence of attachments, attachment names and/or types if any, priority or importance information, message thread information, other standard headers, user-defined headers such as (in the case of e-mail) X-headers; the recipient or recipients' identities; messaging session information, and other aspects and elements.
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