What are main differences between RDF and CoM?
• RDF syntax is represented by a set of resources identified by their references. These resources have three major types: subject, predicate and object. Subject is an item, i.e., a characterized entity. Predicate is a relation or characteristic. Object is a characterizing object or attribute value. • All syntactic elements have their references in RDF. In CoM only items (semantic element) have their references while syntactic elements (concepts, dimensions) do not. (Syntactic elements may have reference on other levels of description, see COFS.) This reflects the principle of separation of space and objects in it. • RDF semantics is represented by triples subject-predicate-object. These triples themselves could be considered a resource and be involved in other triples. • The main indivisible unit of representation in RDF is a triple of subject-predicate-object while in CoM it is an item. In CoM it is very important that item characteristics (superitems) are not separable, i.e., all sup
