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+====== Ontology Language ======
+[[public:99_annexes:annex-b-terms-and-definitions:start|Go up to Terms and Definitions]]
+===== Discussion =====
+An ontology language provides a formal means to express an [[public:99_annexes:annex-b-terms-and-definitions:o:ontology|ontology]]. It supplies constructs for representing concepts, relationships, classifications, assertions, constraints, axioms, annotations, and other ontology content.
+An ontology language differs from the ontology itself. The language provides the expression mechanism. The ontology provides the domain commitments expressed through that mechanism.
+Ontology languages and representation approaches differ in their assumptions, semantics, constraints, reasoning capabilities, and implementation tradeoffs.
+===== Definition =====
+//formal language used to express an ontology//
+===== Source =====
+Generalised from common ontology engineering usage and specialized for use in the FX Demo Reference Architecture.
+===== Note =====
+An ontology language differs from a graph store, serialisation format, modeling tool, or reasoner. Those technologies support ontology implementation, exchange, storage, or processing.
+===== Example =====
+[[public:99_annexes:annex-b-terms-and-definitions:o:owl|OWL]] is an ontology language. An FX transaction ontology expressed in OWL uses OWL constructs and OWL reasoning semantics.
+----
+<WRAP centeralign>
+© 2026 Dido Solutions, Inc. and Jackrabbit Consulting, Inc.
+</WRAP>