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We present an approach for the semantic integration of geoscience data, and a system implementing this approach. Specifically, we demonstrate the use of data ontologies and application of markup languages for semantic integration of data and services. We introduce a domain level object ontology, called Earth and Planetary ONTology (EPONT) to explore, extract, and integrate information from heterogeneous geologic data sets. As proof of concept, we define the DIA engine, an extensibledoi:10.1142/s1793351x10001036 fatcat:5g3fthngl5ezjlgpsvgtwpeqhy