extensible

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extensible

(programming)
Said of a system (e.g., program, file format, programming language, protocol, etc.) designed to easily allow the addition of new features at a later date, e.g. through the use of hooks, an API or plug-ins.

See also extend, forward compatible.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

extensible

Capable of being expanded or customized. For example, with extensible programming languages, programmers can add new control structures, statements or data types.
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