This paper is interested in the assisted interrogation of lexical databases designed according to the LMF standard (Lexical Markup Framework) ISO-24613. The proposed solution is based on a requirement-based lexical web service generation approach that makes easier the task of engineers when developing NLP (Natural Language Processing) systems. Using this approach, the developer will not deal with the database content or its structure. Also, he will not use any language query. For each lexical requirement, we generate through a lexical web service for interrogating LMF databases. Also we generate with it its enhanced WSDL description file that we have enriched by semantic data describing data categories used in the requirement specification.