Abstract
AbstractMeta‐level architectures combined with domain‐specific languages serve as a powerful tool to build and maintain a software product line: Meta‐level architectures lead to adaptable software systems. Executable descriptions capture expert knowledge.We have developed a meta‐level architecture for a software product line of legal expert systems. Four meta‐level mechanisms support both variability and evolution of the product line. Domain analysis had shown that separation of expert knowledge from technical code was essential. Descriptions written in domain‐specific languages reside in the meta level, and serve as specification, code, and documentation. Technical code finds its place in interpreting machines in the base level.We discuss how meta‐level architectures influence the qualities of software product lines and how properties and patterns of the problem space can guide the design of domain‐specific languages. Copyright © 2005 John Wiley & Sons, Ltd.
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