Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Extension Language Kit (ELK) is a free Scheme implementation which is embeddable in C and C++ programs, but can also be used as a stand-alone Scheme interpreter. Elk was written by Oliver Laumann and Carsten Bormann to provide an Extension Language for the development of large C++-based systems such as the ODA document editor ISOTEXT[1] and the videoconferencing system TELES.VISION. It was inspired by the Lisp interpreter in Emacs and has in turn helped inspire developers of other dynamic language interpreters such as Matz' Ruby Interpreter. In 2005 Sam Hocevar became the current maintainer of the Elk scheme project, merging contributed patches and fixing known bugs.

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