raw-wiki-dump/InterWiki.md


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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