Due to different notions of both, it is
impossible to clearly separate ‘ontology’ and ‘model’ [3]. E. g.
ontologies in literature differ in notation, axiomatic richness
and the levels of formality (graphical vs. logic based language;
lightweight vs. heavyweight ontologies; machine-readable vs.
machine-interpretable); similarly, conceptual modeling
languages differ in modeling concepts and their external
notation as well as in operators or rules of inference