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On Bridging and Extending OMG/IDL and STEP/EXPRESS for Achieving Information Sharing and System Interoperability
, 1995
"... This paper describes an integrated information modeling language called NCL which combines the features of IDL and EXPRESS as well as the features of the association types and knowledge rule specifications offered by the Object-oriented Semantic Association Model (OSAM*). In this language, frequentl ..."
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This paper describes an integrated information modeling language called NCL which combines the features of IDL and EXPRESS as well as the features of the association types and knowledge rule specifications offered by the Object-oriented Semantic Association Model (OSAM*). In this language, frequently used constraints are specified by keywords, association types among object classes are specified in association specifications, behavioral properties of objects are defined in method specifications, and complex semantic constraints of various types are specified by EventCondition -Action-AlternativeAction (ECAA) rules. ECAA rules also provide a mechanism for specifying the control relationships among various servers in a heterogeneous computing environment. Keyword constraints and association types are defined in a meta-model (the model of the underlying kernel model of NCL) in terms of parameterized rules which are automatically bound to those classes that use these constraint and associa...
