A computer implemented method for functional integration of metadata for a plurality of databases, includes: creating a single set of classes and instances for the classes for metadata of at least one relational data schema and at least one non-relational data schema for the plurality of databases; defining semantic relationships between the instances based on the structural information in the relational data schema and the non-relational data schema for the plurality of databases; associating the semantic relationships with a property class; creating a single set of triples for the semantic relationships between the instances; storing the single set of triples in a file; and using the set of triples stored in the file to navigate between the plurality of databases to formulate a response to a query.