6. Sketch a news service ontology, which covers the items listed below in part (a) and provides sufficient classes, properties and individuals for part (b).

(a) Indicate hierarchies for both classes and properties. For classes, indicate clearly which are self-standing, which are definable, and which are modiers. Introduce instances of classes if required.

Items to be represented: news programme, studio, presenter, story, news agency, topics: economics, business, etc., control room, production office, studio manager.

(b) Define classes, using your ontology, for the items below in the OWL or Description Logic syntax (or explain why they cannot be expressed in OWL):

- News programme presented by a woman.

- A control room with at least two studio managers working in it.

- News programme with stories on economics but not on science.

If the definition in English is ambiguous, paraphrase it so it is unambiguous and then express the disambiguated notion in OWL or Description Logic.