This paper treats the "compositor" component as a new, distinct, kind of software component. This is analogous to recognizing that compilers, parsers, and UI-generators are distinct kinds of software components. Each has its own domain of discourse and base of concepts, its own structure for expressing desired results, its own internal solution structure, and its own set of research problems. This paper describes a base of concepts suitable for expressing composition and shows how a general composition engine realizing these concepts can be used to effect the composition needs of several existing AOSD approaches.
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