  Web services are accessed via query interfaces which hide databases
containing thousands of relevant information. User's side, distant database is
a black box which accepts query and returns results, there is no way to access
database schema which reflect data and query meanings. Hence, web services are
very autonomous. Users view this autonomy as a major drawback because they need
often to combine query capabilities of many web services at the same time. In
this work, we will present a new approach which allows users to benefit of
query capabilities of many web services while respecting autonomy of each
service. This solution is a new contribution in Information Retrieval research
axe and has proven good performances on two standard datasets.
