8. A method according to claim 1 wherein detecting relationships between the concepts comprises: selecting a set of concepts; and determining the transitive closure of the selected set of concepts.
8. A method according to claim 1 wherein detecting relationships between the concepts comprises: selecting a set of concepts; and determining the transitive closure of the selected set of concepts. 13. A method according to claim 8 wherein selecting a set of concepts comprises selecting all of the concepts.