Domain knowledge
domain knowledge concerns facts which are true in the given domain (namely oil-processing) and which were extracted manually from various multilingual resources [Angelova & Bontcheva 97].
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domain—An area of human activity presumed to contain expertise and knowledge suitable for the basis of an expert or knowledge-based system.
domain knowledge—The facts, procedures, processes, and rules of thumb of a domain.
domain expert — A specialist who possesses knowledge and/or expertise about a particular domain, that is, a source of expertise for developing a knowledge base for use by an expert system.
http://amsglossary.allenpress.com/glossary/browse?s=d&p=39
More particular, in software engineering, domain knowledge is knowledge about the environment in which the target system operates, for example, software agents. Domain knowledge is important, because it usually must be learned from software users in the domain ( as domain specialists/experts), rather than from software developers.
