Information retrieval (IR) and information filtering (IF) are strongly related [3,5]. Information retrieval indexes a large set of documents and when a user asks a query, answers are extracted out of this set. Information filtering processes a stream of documents and for each document arriving in the system a comparison is made with one or more filtering profiles provided by users and in case of a match the document is sent to the user who created the profile. Applications of information filtering are found in competitive intelligence or technology watch. Another way of filtering is to send the document to the user only if the match is negative. This is useful for applications such as child protection or anti-spam.
Another difference is that IR queries are short, for immediate use, with answers expected as if in a conversational mode (in less than few seconds). For Information filtering, queries are...
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