Object Algebras are a recently introduced design pattern to make the implementation of recursive data types more extensible. In this short paper we report our experience in using Object Algebras in building a realistic domain-specific language (DSL) for questionnaires, called QL. This experience has lead to a simple, yet powerful set of tools for the practical and flexible implementation of highly extensible languages.
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Domain Specific Languages: A Big Future for Small Programs
International Conference on Generative Programming: Concepts and Experiences
Software Analysis and Transformation

Gouseti, M., Peters, C., & van der Storm, T. (2014). Extensible language implementation with object algebras (short paper). doi:10.1145/2658761.265876