Supports Natural Language. So you can formulate you query as simply as if you were speaking. DigOut4U is already bilangual. So you may ask a question in french or english and obtain results in french and english (other languages will be added to the system). The query youre asking for is understood in a specific context. Words are not only considered as a sequence of characters but they have sense (semantic analysis). In fact, words are not searched as in a full-text system, but the associated ideas or concepts coming from the word are searched.