This variety makes it difficult to get a clear picture of the fundamental properties. Second, although controlled natural languages seem to share important properties, they also exhibit a very wide variety: Some are inherently ambiguous, others are as precise as formal logic virtually everything can be expressed in some, only very little in others some look perfectly natural, others look more like programming languages some are defined by just a handful of grammar rules, others are so complex that no complete grammar exists. People from different backgrounds often used and continue to use different names for the same kind of language. First, CNL approaches emerged in different environments (industry, academia, and government), in different disciplines (computer science, philosophy, linguistics, and engineering), and over many decades (from the 1930s until today). The goal of this article is to provide a common terminology and a common model for CNL, to contribute to the understanding of their general nature, to provide a starting point for researchers interested in the area, and to help developers to make design decisions.Īs the variety of attributes suggests, there is no general agreement on the characteristic properties of CNL, making it a very fuzzy term. Classification of these languages reveals that they form a single scattered cloud filling the conceptual space between natural languages such as English on the one end and formal languages such as propositional logic on the other.
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A comprehensive survey of existing English-based CNLs is given, listing and describing 100 languages from 1930 until today. To bring order to the variety of languages, a general classification scheme is presented here. Despite the apparent differences, it seems sensible to put all these languages under the same umbrella. They are applied to improve communication among humans, to improve translation, or to provide natural and intuitive representations for formal notations. Especially during the last four decades, a wide variety of such languages have been designed.
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What is here called controlled natural language (CNL) has traditionally been given many different names.