| http://www.w3.org/ns/prov#value | - Detailed description is given for the case that, for example, the sending list storage unit 206 holds as a sending list in which user information (a user ID, a user name and the like), a destination address (communication destination information such as a telephone number, an IP address, a mail address and the like) and the trustability of each user are associated with each other.
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