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{{Multiple issues|section=|{{Notability|date=March 2018}}|{{Lead missing|date=March 2021}}}}
{{Infobox programming language
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{{Portal|Free and open-source software}}
'''XL''' ("eXtensible Language") is the first [[computer]] [[programming language]] designed to support concept programming.<ref>{{cite news|url=https://www.theregister.co.uk/2008/01/16/concept_programming |title=Dip into Concept Programming |first=Phil |last=Manchester |publisher=[[The Register]] |date=2008-01-16| access-date=2010-02-03}}</ref>
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 programming|imperative language]]. Programmers can write their own plug-ins to implement application-specific notations, such as [[derivative|symbolic differentiation]], which can then be used as readily as built-in language features.
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