Due to the increasing usage of small and low footprinted devices like mobile phones as clients of mobile information systems a new problem arises: “How to determine the relevance of updates for a large number of mobile clients?” In this paper we present an indexing scheme that represents conjunctive queries posed by the mobile clients in a trie. So, IDs of the clients are referenced by their queries and checking the relevance of an update can be efficiently done by a trie lookup.
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