| 摘要 |
A network-based search system is disclosed in which queries and information records are qualified by temporal and geographical references, such as those provided by a map-based directory system. Briefly, queries are submitted using text strings together with time tags and location tags. Time tags and location tags refer to the date/time the query was last submitted for a search and the geographical area of interest (defined by ranges of latitud e and longitude coordinates), respectively. The information records being searched preferabl y contain similar time and location tags. However, time and location tags associated with info rmation records refer to the date/time the record was last modified and the origin of the re cord, respectively. A mechanism is also provided for determining location tags for records that do not include location tags. In all, a comparison between the time and location tags associated wit h a query and the time and location tags associated with the information records permits geogr aphically irrelevant records to be suppressed and allows the user to automatically receive only i nformation that has been modified since the user last requested it. Thus, search results are aut omatically pre-filtered prior to being transmitted to the user who originated the query, thereby con serving network resources and reducing the amount of context-based filtering required of the user.
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