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+WikiLinks
+=========
+
+Summary
+-------
+
+An extension to Python-Markdown that adds [WikiLinks][]. Specifically, any 
+``[[bracketed]]`` word is converted to a link.
+
+[WikiLinks]: http://en.wikipedia.org/wiki/Wikilink
+
+This extension has been included in the Markdown library since 2.0.
+
+Syntax
+------
+
+A ``[[bracketed]]`` word is any combination of  upper or lower case letters,
+number, dashes, underscores and spaces surrounded by double brackets. Therefore 
+
+    [[Bracketed]]
+
+Would produce the following html:
+
+    <a href="/Bracketed/" class="wikilink">Bracketed</a>
+
+Note that wikilinks are automatically assigned `class="wikilink"` making it 
+easy to style wikilinks differently from other links on a page if one so 
+desires. See below for ways to alter the class.
+
+You should also note that when a space is used, the space is converted to an
+underscore in the link but left as-is in the label. Perhaps an example 
+would illustrate this best:
+
+    [[Wiki Link]]
+
+Becomes
+
+    <a href="/Wiki_Link/" class="wikilink">Wiki Link</a>
+
+Usage
+-----
+
+From the Python interpreter:
+
+    >>> text = "Some text with a [[WikiLink]]."
+    >>> html = markdown.markdown(text, ['wikilink'])
+
+The default behavior is to point each link to the document root of the current 
+domain and close with a trailing slash. Additionally, each link is assigned to 
+the html class `wikilink`. This may not always be desirable. Therefore, one can
+customize that behavior within Python code. Three settings are provided to 
+change the default behavior:
+
+1. **base_url**: String to append to beginning of URL. 
+
+    Default: `'/'`
+
+2. **end_url**: String to append to end of URL.
+
+    Default: `'/'`
+
+3. **html_class**: CSS hook. Leave blank for none.
+
+    Default: `'wikilink'`
+
+For an example, let us suppose links should always point to the subdirectory 
+`/wiki/` and end with `.html`
+
+    >>> html = markdown.markdown(text, 
+    ...     ['wikilink(base_url=/wiki/,end_url=.html)']
+    ... )
+
+The above would result in the following link for `[[WikiLink]]`.
+
+    <a href="/wiki/WikiLink.html" class="wikilink">WikiLink</a>
+
+The option is also provided to change or remove the class attribute.
+
+    >>> html = markdown.markdown(text, 
+    ...     ['wikilink(base_url=myclass)']
+    ... )
+
+Would cause all wikilinks to be assigned to the class `myclass`.
+
+    <a href="/WikiLink/" class="myclass">WikiLink</a>
+
+The same options can be used on the command line as well:
+
+    python markdown.py -x wikilink(base_url=http://example.com/,end_url=.html,html_class=foo) src.txt
+
+Some may prefer the more complex format when calling the `Markdown` class directly:
+
+    >>> md = markdown.Markdown( 
+    ...     extensions = ['wikilink'], 
+    ...     extension_configs = {'wikilink': [
+    ...                                 ('base_url', 'http://example.com/'), 
+    ...                                 ('end_url', '.html'),
+    ...                                 ('html_class', '') ]},
+    ...     safe_mode = True
+    ... )
+    >>> html = md.convert(text)
+
+Using with Meta-Data
+--------------------
+
+The WikiLink Extension also supports the [[Meta-Data]] Extension. Please see 
+the documentation for that extension for specifics. The supported meta-data 
+keywords are:
+
+* `wiki_base_url`
+* `wiki_end_url`
+* `wiki_html_class`
+
+When used, the meta-data will override the settings provided through the  
+`extension_configs` interface. 
+
+This document:
+
+    wiki_base_url: http://example.com/
+    wiki_end_url:  .html
+    wiki_html_class: 
+
+    A [[WikiLink]] in the first paragraph.
+
+would result in the following output (notice the blank `wiki_html_class`):
+
+    <p>A <a href="http://example.com/WikiLink.html">WikiLink</a> in the first paragraph.</p>
+