Extension:CrossCat

This extension is under development and should not be used in a production environment.

The CrossCat extension allows user to navigate through categories and categories intersections and to create an article in an intersection of categories. It implements some of the features requested in http://en.wikipedia.org/wiki/Wikipedia:Category_intersection en:Wikipedia:Category_intersection].

It has be designed to be compatible with the Extension:CategoryTree extension, although the purpose of CrossCat is to change the way category pages are used and displayed in MediaWikis.

Article
Unsing CrossCat, The "categorylinks" panel at the bottom of the article pages provides now checkboxes that allows user to select or unselect a category in the intersection of categories which contains the article. Press the "Exlore" button and you will be directed to the intersection page.

Category page
A category page doesn't show articles anymore (unless you use an option for forcing it). You can create a subcategory or put the category in a supercategory : just fill a text box and click the button.

A category page provides also a link to the corresponding intersection page.

Intersection page
An intersection page looks like a category page, but the purpose is different. It displays the articles, and not subcategories (unless you want to do the transition). You can create an article that is subcategorized in all the categories, just filling a text box. As in article pages, you can use check boxes to view a new intersection. You can also navigate in parent(s) or children of the categories, or add a category to intersect with the others.

To access directly an intersection page, just type : "Intersection:Cat1::Cat2::Cat3" in the search box.

Download instructions

 * Download the latest release from sourceforge
 * Extract to temporary folder
 * Read installation instructions in section below

Installation
To install this extension, add the following to LocalSettings.php:

Note: $IP stands for the root directory of your MediaWiki installation, the same directory that holds LocalSettings.php.

Configuration parameters

 * : if true, allows the creation of an intersection article (not recommended);
 * : if true, the intersection includes all the subcategories of intersected categories ;
 * : false ;
 * : false ;
 * : true, to allow Javascript to display the intersection navigator in article pages ;
 * : a matrix to determine which page displays what.