public static IEnumerable <OntologyProperty> IsExhaustiveDomainOfUniques(this OntologyClass oClass)
{
IEnumerable <OntologyProperty> allProperties = oClass.IsExhaustiveDomainOf();
IEnumerable <OntologyProperty> allUniqueProperties = allProperties.GroupBy(property => property.GetIri().ToString()).Select(group => group.First());
return(allUniqueProperties);
}