Solutions
Specify and standardize terminology usage: ontology
Globally all interacting sources
- wonderful for users and their programs
- long time to achieve, 2 sources (UAL, BA), 3 (+ trucks), 4, · all ?
- costly maintenance, since all sources evolve
- who has the authority to dictate conformance
Domain-specific XML DTD assumption
- Small, focused, cooperating groups
- high quality, some examples - genomics, arthritis, shakespeare plays
- allows sharable, formal tools
- ongoing, local maintenance affecting users - annual updates
- poor interoperation, users still face inter-domain mismatches
solves only part of the problem