XL (programming language)

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XL ("eXtensible Language") is the first computer programming language designed to support concept programming.^[1]

XL features programmer-reconfigurable syntax and semantics. Compiler plug-ins can be used to add new features to the language. A base set of plug-ins implements a relatively standard imperative language. Programmers can write their own plug-ins to implement application-specific notations, such as symbolic differentiation, which can then be used as readily as built-in language features.

External links

• Official website
• The historical development site
• Slides presenting XL and Concept Programming

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