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## 14 Working with source code

Source code can be included in Org mode documents using a ‘`src`’ block, e.g.:

    #+BEGIN_SRC emacs-lisp
      (defun org-xor (a b)
         "Exclusive or."
         (if a (not b) b))
    #+END_SRC

Org mode provides a number of features for working with live source code, including editing of code blocks in their native major-mode, evaluation of code blocks, converting code blocks into source files (known as tangling in literate programming), and exporting code blocks and their results in several formats. This functionality was contributed by Eric Schulte and Dan Davison, and was originally named Org-babel.

The following sections describe Org mode’s code block handling facilities.

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