a textual description of each class, its associations, attributes, and operations
a collection of descriptions of the data objects or items in a data model for the benefit of program mers and others who might need to refer to them
a description of the features and attributes relevant to the project
a list that maintains, for each coverage, the names of the attributes and a description of the attribute vales (including a description of each code, if necessary)
Similar to a library. It contains all of the ASN.1 descriptions of all of the data types used by the Active Object Class.