On the relationship between models and ontologies.

Furthermore, some constructs that class diagrams offer, such as multiplicities, are not well-represented in the typical ontology approaches, but also the idea of rule-based derivation of knowledge is not present in class diagrams. The application of ontologies toward various engineering domains has gained much momentum recently, such that it is beneficial to understand the relationship between ontology building and modeling. The UML (which not only contains class diagrams, but also provides a set of behavior modeling techniques, a logic language, and a precisely standardized syntax) is easily able to cover the language constructs that typical ontology approaches provide. [Extracted from the article]