Abstract
The goal of feature-oriented programming (FOP) is to modularize software systems in terms of features. A feature refines the content of a base program. Both base programs and features may contain various kinds of software artifacts, for example, source code in different languages, models, build scripts, and documentation. We and others have noticed that when composing features, different kinds of software artifacts can be refined in a uniform way, regardless of what they represent. We present gDeep, a core calculus for feature composition, which captures the language independence of FOP; it can be used to compose features containing many different kinds of artifact in a type-safe way. The calculus allows us to gain insight into the principles of FOP and to define general algorithms for feature composition and validation. We provide the formal syntax, operational semantics, and type system of gDeep and outline how languages like Java, Haskell, Bali, and XML can be plugged in.
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