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+====== Support for InterWiki links ======
+//(since [[:milestone:0.10]])//
+===== Definition =====
+An InterWiki link can be used for referring to a Wiki page
+located in another Wiki system, and by extension, to any object
+located in any other Web application, provided a simple URL
+mapping can be done.
+At the extreme, InterWiki prefixes can even be used to simply introduce
+links to new protocols, such as `tsvn:` used by TortoiseSvn.
+===== Link Syntax =====
+<code>
+<target_wiki>(:<identifier>)+
+</code>
+The link is composed by the targeted Wiki (or system) name,
+followed by a colon (e.g. `MeatBall:`),
+followed by a page specification in the target.
+Note that, as for InterTrac prefixes, **InterWiki prefixes are case insensitive**.
+The target Wiki URL is looked up in the InterMapTxt wiki page,
+modelled after MeatBall:InterMapTxt.
+In addition to traditional InterWiki links, where the target
+is simply //appended// to the URL,
+Trac supports parametric InterWiki URLs:
+identifiers `$1`, `$2`, ... in the URL
+will be replaced by corresponding arguments.
+The argument list is formed by splitting the page identifier
+using the ":" separator.
+===== Examples =====
+If the following is an excerpt of the InterMapTxt page:
+<code>
+====== InterMapTxt ======
+===== This is the place for defining InterWiki prefixes =====
+Currently active prefixes: [[:[InterWiki]]]
+This page is modelled after the MeatBall:InterMapTxt page.
+In addition, an optional comment is allowed after the mapping.
+----
+<code>
+PEP      http://www.python.org/peps/pep-$1.html           # Python Enhancement Proposal $1
+Trac-ML  http://thread.gmane.org/gmane.comp.version-control.subversion.trac.general/$1  # Message $1 in Trac Mailing List
+tsvn     tsvn:                                            # Interact with TortoiseSvn
+...
+MeatBall http://www.usemod.com/cgi-bin/mb.pl?
+MetaWiki http://sunir.org/apps/meta.pl?
+MetaWikiPedia http://meta.wikipedia.org/wiki/
+MoinMoin http://moinmoin.wikiwikiweb.de/
+...
+</code>
+</code>
+Then,
+  * `MoinMoin:InterWikiMap` should be rendered as MoinMoin:InterWikiMap
+   and the //title// for that link would be "!InterWikiMap in MoinMoin"
+  * `Trac-ML:4346` should be rendered as Trac-ML:4346
+   and the //title// for that link would be "Message 4346 in Trac Mailing List"
+----
+See also: InterTrac, InterMapTxt