InterWiki
(since [trac:milestone:0.10])
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 [trac:TortoiseSvn].
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 `[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.
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:
If the following is an excerpt of the InterMapTxt page:
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