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========================= FOOTNOTES =================================
This section adds footnote handling to markdown. It can be used as
an example for extending python-markdown with relatively complex
functionality. While in this case the extension is included inside
the module itself, it could just as easily be added from outside the
module. Not that all markdown classes above are ignorant about
footnotes. All footnote functionality is provided separately and
then added to the markdown instance at the run time.
Footnote functionality is attached by calling extendMarkdown()
method of FootnoteExtension. The method also registers the
extension to allow it's state to be reset by a call to reset()
method.
Example:
Footnotes[^1] have a label[^label] and a definition[^!DEF].
[^1]: This is a footnote
[^label]: A footnote on "label"
[^!DEF]: The footnote for definition
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Returns: a list of post processed items and the unused
remainder of the original list
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