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+# Support for InterWiki links
+
+## 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.
+
+InterWiki prefixes can even be used to simply introduce links to new protocols, such as `tsvn:` used by [trac:TortoiseSvn TortoiseSvn].
+
+## Link Syntax
+
+```
+<target_wiki>(:<identifier>)+
+```
+
+The link is composed by the targeted Wiki (or system) name, followed by a colon, eg `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 `[interwiki]` section of TracIni or in the InterMapTxt wiki page, modeled after MeatBall:InterMapTxt. If a prefix is defined in both the `[interwiki]` section and InterMapTxt, the `[interwiki]` section takes precedence.
+
+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.
+
+### [interwiki]
+
+Every option in the `[interwiki]` section in TracIni defines one InterWiki prefix. The option name defines the prefix. The option value defines the URL, optionally followed by a description separated from the URL by whitespace. Parametric URLs are supported as well.
+
+**Example:**
+```#!ini
+[interwiki]
+MeatBall = http://www.usemod.com/cgi-bin/mb.pl?
+PEP = http://www.python.org/peps/pep-$1.html Python Enhancement Proposal $1
+tsvn = tsvn: Interact with TortoiseSvn
+```
+
+## Examples
+
+If the following is an excerpt of the InterMapTxt page:
+
+```
+= 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.
+----
+```
+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/
+...
+```
+```
+
+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