10. A system, comprising: a memory device for storing a program; a processor in communication with the memory device, the processor operative with the program to: define a meta-ontology, wherein the meta-ontology includes high-level properties and their mappings to specific properties defined in a plurality of different ontologies; receive a question, wherein the question is associated with a high-level property; and provide an answer to the question, wherein the answer is determined by referring only to the meta-ontology to retrieve required information, and in answering a question about a concept, synonyms of the concept's name used in the question are retrieved, and then, the synonyms are used to retrieve corresponding uniform resource identifiers, wherein a synonym is a high-level property included in a resource description framework description of each of the ontologies, wherein the resource description framework description of a first ontology of the ontologies describes how a first synonym corresponds to a first property from the first ontology and how the first synonym is queried such that the first synonym can be retrieved from the first ontology.
10. A system, comprising: a memory device for storing a program; a processor in communication with the memory device, the processor operative with the program to: define a meta-ontology, wherein the meta-ontology includes high-level properties and their mappings to specific properties defined in a plurality of different ontologies; receive a question, wherein the question is associated with a high-level property; and provide an answer to the question, wherein the answer is determined by referring only to the meta-ontology to retrieve required information, and in answering a question about a concept, synonyms of the concept's name used in the question are retrieved, and then, the synonyms are used to retrieve corresponding uniform resource identifiers, wherein a synonym is a high-level property included in a resource description framework description of each of the ontologies, wherein the resource description framework description of a first ontology of the ontologies describes how a first synonym corresponds to a first property from the first ontology and how the first synonym is queried such that the first synonym can be retrieved from the first ontology. 13. The system of claim 10 , wherein the high-level properties are represented in a resource description framework description.