| 摘要 |
A geographic information system for operation with an accreditation database storing identities of information providers and indications of whether each of those information providers is a member of an accreditation group, the system comprising a geographic information database for storing a list of information sources external to the database together with, for each source, the identity of an information provider associated with the source and one or more geographic definitions associated with the source, a search unit for receiving from a user an indication of a geographic location, accessing the geographic information database to form a set of information sources whose geographic definitions encompass that location and associated with an information provider that is indicated by the accreditation database as being a member of one or more predetermined accreditation groups, and making that set of information sources available to the user.
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