IATA rules and guidelines for the development of airline messaging standards in AIDM pillars (Business, Information, Technology) and layers 4 layers (Contextual, Conceptual, Logical, Physical). Separate guideline document do exist for each of the partitions defined by the pillar and layer:
This file contain all the latest technical standards and best practices for AIDM Modeling Guidelines, endorsed by the Architecture and Technology Strategy Board for passenger standards development.