40. The at least one non-transitory computer-readable medium of claim 29 , wherein said legality expression is based on a legality expression language.
40. The at least one non-transitory computer-readable medium of claim 29 , wherein said legality expression is based on a legality expression language. 41. The at least one non-transitory computer-readable medium of claim 40 , wherein said legality expression language comprises a grammar based language.