ODM11 — No stereotype for OWL individuals

From the ODM FTF2 meeting minutes, February 20th: There is currently no stereotype available for individuals in the OWL Profile. Participants agreed that we would like to have a stereotype <<owlIndividual>> on UML instance specifications for individual, and would want an additional constraint saying that such an instance specification would only have one value, i.e., that it specifies a single individual; also, what if we have a singleton, but not the corresponding individual? We would still translate the singleton class to an OWL individual in this case ... see issue 10908 (related issue in the mapping chapter).

Add a stereotyped instance specification for <<owlIndividual>> and the corresponding constraint, as suggested.