ABSTRACT
In a mobile environment, the need for localized data becomes inevitable with the increase in people’s mobility and change of working habits. Queries asked in the mobile environment may have a slightly different structure and format from traditional database queries. For example, the query, “What are the names and addresses of the restaurants within five miles?” seeks for the restaurants within five miles of the current position of the query issuer. To provide the answer to the query, first the application has to know the location of the issuer. The query can later be bound to this location. Thus, location dependence in queries implies that the information asked is related to a location, but the location is not explicitly known when the query is asked. Therefore, there seems to be a layered approach in processing these new types of queries.
