Search method of tree data structures

In modern data retrieval systems the main problem is how to store data properly and how to reach a high speed of processing of users researching requests. It is worth noting that the main point of information retrieval systems is not only research of exact conformity of requesting information, but also the point of researching of relevant information, where the level of relevance could be determined as the level of its semantic proximity to the researching request. Thus researching requests in such a kind of systems must be based on natural language in where initial information is formulated.