Technology of application of ontology design patterns for acceleration of queries execution in ontology based data access systems

One of the known approaches to the construction of knowledge-based systems is the Ontology-based data access (OBDA) approach, which involves combining an ontology that represents a domain conceptual system and a relational database used to store data that corresponds to the concepts defined in the ontology. In this case, the ontology is used as the basis for the formation of user queries, and the database for obtaining the results of their execution. The article proposes a technology for improving the performance of queries to such systems by preliminarily database preparation, taking into account that the used ontology have been developed with using content ontology design patterns (CDP). These patterns are small ontology fragments that describes generalized situations of the domain (for example, participation in an event, the execution of some role, the parts of an object, etc.). The novelty of this technology determines the possibility of its application for a whole class of ontologies based on ontological patterns. The general principle of ontology-based data access system is considered. The description of the proposed technology, as well as its implementation for a specific ontology, and an experimental evaluation of the obtained results are described.