... Next: Proposed FITS Keywords Up: Data Models and Previous: Propagating Uncertainties and . ... The Abstract Data Interface (ADI) is a system within which both abstract data models and their mappings on to file formats can be defined. The data model system is object-oriented and closely follows the Common Lisp Object System (CLOS) object model. ... ADI is a system for defining ``abstract data models.' ... ADI was designed as an object-oriented system where data models are defined as classes. ...