These examples do not completely illustrate the full power of a 'third generation' multi-dimensional classification for public health, developed using a formal ontologybuilding tool such as Protégé. While nothing can replace human knowledge and intelligence in the comprehensive collection, description (classification, indexing) and use of complex information, in the future it is envisaged that semantic tagging 62 of documentation and other written resources will allow much more meaningful information to be routinely made available to humans, through machine processing of this 'computable' information. More information on this aspect of the project is presented in Appendix D.