Throughout this book, we'll be returning to a sample plugin, a knowledgebase, to provide additional insight into a topic, or to provide code samples. The plugin we're discussing has actually been developed over a number of years, and has numerous contributors.

For the purposes of this book and any future examples, our knowledgebase is a plugin that offers a hybrid solution that lies somewhere between Redmine's wiki and document functionality.

It allows us to create articles that can be stored within categories. Categories are stored in a hierarchical fashion, so a category "tree" can be presented to users on the knowledgebase landing page, as seen in the following screenshot: