Powerful as MediaWiki is, you can make it even more so by adding extensions: third-party plug-ins that provide additional features. Extensions cover a wide range of functionality, such as:
Converting wiki articles to PDF format
Inserting Google maps into an article
Adding a CAPTCHA image to the login page
Creating fill-in-the-blanks web forms
Automatic syntax-highlighting of displayed source code
Replacing the wiki’s search engine
In this chapter, we’ll install extensions and survey some recommended ones. And in Chapter 15, you’ll see how you can create your own extensions (programming is required).
Apart from ordinary Googling, here are two effective ways to learn about and locate extensions:
Examining your favorite MediaWiki sites to see which extensions they have installed
Visiting MediaWiki.org’s catalog of extensions
While working on a MediaWiki site such as Wikipedia, you might
see a feature that other MediaWiki sites don’t have. Suppose you
notice an article with an image link: that is, a graphical image
that is a link to another page, produced by the tag
<imagemap>. Image links are not built into MediaWiki. What is
this feature, and how can you obtain it for your own wiki?
To locate the origin of an extension, visit the
Special:Version page, which lists all
extensions installed on a wiki (see Version). Among the many entries on http://www.wikipedia.org/wiki/Special:Version, you’ll see a “parser hook” extension ...