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At the hour of the social Web, we present a solution being able to be used as a basis for the definition of new services such as au tomatic and dynamic construction of communities of users: the aggregation of keywords. Taggregates of keywords result from former research of the users of a search engine. We present the process which we followed to obtain an algorithm for gathering keywords coming fr om log files (tracing files); we illustrate this algorithm through its application to a log fil e of the search engine aol.com. At ends of evaluation and validation, we propose to compare the results obtained by the search engine starting from the aggregates of keywords thus create d and to define a semantic coefficient of coherence of these aggregates. We measure in an exp erimentation the loss of semantic coherence related to the increase in size of the ag gregates. The interest of the approach suggested lies in the fact that it can be regarded as a basis for a great number of "community" systems and thus exploited to offer eve n more services to the user.

Agrégats de mots-clés validés sémantiquement Pour de nouveaux services d'accès à l'information sur internet