The DSLAnnotatedBibliography also refers to the "Domain as a set of systems" perspective adopted in the SoftwareReuse and DomainEngineering communities.
GenerativeProgrammingBook, p. 34, is more courageous, and defines a domain as an area of knowledge which:
SemanticDesigns defines a domain as a formal system of notation having a formal semantics. Their DMSSoftwareReengineeringToolkit supports this notion directly, by enabling a DomainEngineer? to define notations directly, and to define semantics via various means, including attribute evaluators for analyzers and program transformations as axioms and/or implementation methods. Typically one defines a domain for practical reasons, and so these tend to closely match the GenerativeProgrammingBook definition, above, in intent.
CategoryDSL | ArieVanDeursen - 11 May 2001