This class comprises immaterial items, including but not limited to stories, plots, procedural prescriptions, algorithms, laws of
physics or images that are, or represent in some sense, sets of propositions about real or imaginary things and that are documented as
single units or serve as topics of discourse. This class also comprises items that are “about” something in the sense of a subject. In the
wider sense, this class includes expressions of psychological value such as non-figural art and musical themes. However, conceptual items
such as types and classes are not instances of E89 Propositional Object. This should not be confused with the definition of a type, which
is indeed an instance of E89 Propositional Object.