Abstract: A query processor operative to accept queries with respect to data and to formulate responses to the queries and a data system comprising a query analyzer operative to perform breakdown analysis of queries thereby to generate a hierarchical representation of queries and a hierarchical query storage unit operative to store the hierarchical representations. A hierarchical representation processor operative to receive hierarchically represented queries and to formulate all possible multi dimensional roles of its query elements; and a multi dimensional role storage unit operative to store the hierarchical representations with their respective multi dimensional roles. A stochastic query processor operative to accept the hierarchical representations with their respective multi dimensional roles and to eliminate all improbable combinations of query elements (clause components) and multi dimensional roles.