Method and tool for the automatic reformulation of search keyword strings in document search systems

Method for the automatic reformulation of search keyword strings (query) in document search systems that comprises the steps of: formulating the query in a functional manner in the form of verb + object pair or object + verb pair in a natural human language; carrying out a step expanding the verb + object pair or the object + verb pair consisting in the automatic analysis of said pair and in calculating the verb + object or object + verb alternative pairs; generating a set as a list or the like of verb + object or object + verb alternative pairs; creating a ranking of said pairs by assigning a weight to each pair, which weight is determined on the basis of the occurrence of the individual pair in the documents identified by carrying out the search on the basis of at least one of said pairs; generating a query with a number of alternative terms as regards the object and/or the verb that in the condition matched with each other produce the highest number of document occurrences, that is documents having such pair and that can be freely selected and matched by the user; generating a user graphical interface showing the pairs of terms "object" and "verb" generated at the previous step and/or the verb + object or object + verb alternative pairs generated at the previous step in the form of graphical entities that can be selected and used as document search input queries.