Use of these "subset" categories makes it difficult to find all members of a "higher level" category either articles have to be added to both the "subset" and "higher level" categories or the members of the "subcategories" (and, recursively, their subcategories) have to be enumerated. It is possible to take a category and subcategorize it in many different ways. Multiple category taxonomies have been part of the categorization scheme from the beginning. Due to the combination of the performance change and CategoryTOC, there is no longer any reason that categories need to be small. With the table of contents it became possible to navigate through very large categories with a few clicks. In mid 2005 the category table of contents template,, was created. The performance considerations of large categories and page-by-page navigation precipitated policies to depopulate large categories into smaller subcategories. This page by page navigation mechanism becomes impractical with large categories, as it takes much too long to see the entries at the end of the alphabet. If there are more than 200 entries, users must navigate through multiple pages in order to see all the entries. Very large categories caused performance problems, and a software change was made to limit the search result to 200 entries at a time. When categories were initially added to Wikipedia in 2004 there was no mechanism to limit the search result for large categories. 7.3 Magnus Manske category intersection tool.7.2 Mediawiki extension "Multi-Category Search".4.3 Categories as an index: Primary categories.4.2 Categories as a table of contents: Browsing.3.3 Option: Separate intersection space.3.2 Option: Named indexes, separate from categories.3.1 Option: Transclude intersections into categories.2.2 New namespace for category intersections.1.1 Using MediaWiki search to find category intersections.It is designed to augment the current categorization system, not replace it. This proposal tries to envision the changes necessary to make category intersection a reality. Categories in the German Wikipedia are already organized into fully populated primary categories. Although these "primary" categories are today generally subdivided into subcategories, if they were directly (fully) populated the "intersection categories" could be automatically generated. Many existing categories are logically the intersection of attributes for which "primary" categories exist, for example Category:American actors is logically the intersection of Category:Actors and Category:American people. Category intersection also offers the possibility of adding several new features that will benefit users by adding valuable research and indexing tools as well as making the category system easier to manage. It is hoped that these changes will solve some long-standing categorization problems and end some common conflicts between Wikipedia editors. It requires a change to the MediaWiki software as well as a major change to the policies related to how categories are populated. The blue category A, the pink category B and the violet intersection called A ∩ BĬategory intersection is the ability to find all articles that are members of more than one category.
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