This is the standard gettext function, although slightly optimised.
+#### `urlto($$)`
+
+Construct a relative url to the first parameter from the second.
+
+#### `targetpage($$)`
+
+Passed a page and an extension, returns the filename that page will be
+rendered to.
+
## RCS plugins
ikiwiki's support for revision control systems also uses pluggable perl
It's also possible to write plugins that add new functions to
[[PageSpecs|PageSpec]]. Such a plugin should add a function to the
IkiWiki::PageSpec package, that is named `match_foo`, where "foo()" is
-how it will be accessed in a [[PageSpec]]. The function will be passed two
-parameters: The name of the page being matched, and the thing to match
-against. It should return true if the page matches.
+how it will be accessed in a [[PageSpec]]. The function will be passed
+three parameters: The name of the page being matched, the thing to match
+against, and the page that the matching is occuring on. It should return
+true if the page matches.