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Editing Help:Categories
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Categories, a software feature of MediaWiki, provide automatic indexes that are useful as tables of contents. | Categories, a software feature of MediaWiki, provide automatic indexes that are useful as tables of contents. | ||
You can categorize pages and files by adding one or more '''Category''' {{#ifeq:Category|{{ns:category}}||'''({{ns:category}})'''}} tags to the content text. These tags create links at the bottom of the page that take you to the list of all pages in that category, which makes it easy to browse related articles. | You can categorize pages and files by adding one or more '''Category''' {{#ifeq:Category|{{ns:category}}||'''({{ns:category}})'''}} tags to the content text. These tags create links at the bottom of the page that take you to the list of all pages in that category, which makes it easy to browse related articles. | ||
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== Summary == | == Summary == | ||
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* at their end, an ever present, automatically generated, alphabetical list of all pages in that category, in the form of links. (In fact, in ASCII order. See [[wikipedia:mw:Help:Special page|Special page]]). | * at their end, an ever present, automatically generated, alphabetical list of all pages in that category, in the form of links. (In fact, in ASCII order. See [[wikipedia:mw:Help:Special page|Special page]]). | ||
− | To assign a category to a page | + | To assign a category to a page, simply add the link "<nowiki>[[</nowiki>Category:''Category name'']]" to the page's wikitext. The usual place to add it is at the bottom of the page. |
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− | The usual place to add | ||
− | To link a category page within a page as a normal wiki link (without adding the page to the category), prefix the link name with a colon. For example: <nowiki>[[</nowiki>:Category: | + | To link a category page within a page as a normal wiki link (without adding the page to the category), prefix the link name with a colon. For example: <nowiki>[[</nowiki>:Category:Not in this category]] |
− | New categories can be [[ | + | New categories can be [[Help:Starting a new page|created]] before assigning any page to it, in the same way as any other regular page. |
Individual wikis may have their own top-level categories, such as [[wikipedia:Category:Contents|Category:Contents]] in Wikipedia. | Individual wikis may have their own top-level categories, such as [[wikipedia:Category:Contents|Category:Contents]] in Wikipedia. | ||
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For a complete list of all categories which have at least one page, see [[Special:Categories]]. | For a complete list of all categories which have at least one page, see [[Special:Categories]]. | ||
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To add a page or uploaded file to a category, simply edit the page and add the following text (where '''''Name''''' is the name of the category you want to add it to). | To add a page or uploaded file to a category, simply edit the page and add the following text (where '''''Name''''' is the name of the category you want to add it to). | ||
− | <nowiki>[[</nowiki>{{ns:category}}:'''''Name''''']] | + | <nowiki>[[</nowiki>{{ns:category}}:'''''Name''''']] |
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Any number of {{ns:category}} tags may be added to the page and the page will be listed in all of them. {{ns:category}} tags, along with [[Manual:Interwiki#Interwiki_links_to_other_languages|interwiki language links]] placed in the sidebar, are usually added at the very bottom of the page for the convenience of other editors. | Any number of {{ns:category}} tags may be added to the page and the page will be listed in all of them. {{ns:category}} tags, along with [[Manual:Interwiki#Interwiki_links_to_other_languages|interwiki language links]] placed in the sidebar, are usually added at the very bottom of the page for the convenience of other editors. | ||
On a categorised page, categories are displayed in the Categories: box strictly in the order they appear in the wikitext. | On a categorised page, categories are displayed in the Categories: box strictly in the order they appear in the wikitext. | ||
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+ | If $wgUseCategoryBrowser is set to true, under the first list each category is listed again, [[wikipedia:breadcrumb (navigation)|breadcrumb]]-style, with all its parent categories, sorted alphabetically. (At least in MediaWiki 1.18.2) if a category is a subcategory of more than one parent, both hierarchies will be listed, but the tagged category will be stripped off all but one of these. This creates the potential for what appear to be duplicate entries if a category with multiple parents ''and'' one of its parents are both tagged on a page. For example suppose Maryanne is a subcategory of both Mary and Anne. If a page tags categories Maryanne and Anne then the Category breadcrumbs will show | ||
+ | Anne | ||
+ | Anne | ||
+ | Mary -> Maryanne | ||
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+ | "Anne" appears to be duplicated, but what is meant is | ||
+ | Anne | ||
+ | Anne -> Maryanne | ||
+ | Mary -> Maryanne | ||
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+ | This is probably a bug, and has been reported in [https://bugzilla.wikimedia.org/show_bug.cgi?id=33614 Bug 33614]. | ||
===Sort key=== | ===Sort key=== | ||
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A ''sort key'' specifies under which letter heading, and where in the category list, the page will appear. You can add a sort key by placing it inside the tag after a pipe character. For example, the tag below will add the page under heading "S". | A ''sort key'' specifies under which letter heading, and where in the category list, the page will appear. You can add a sort key by placing it inside the tag after a pipe character. For example, the tag below will add the page under heading "S". | ||
− | <nowiki>[[</nowiki>{{ns:category}}:'''''Name'''''|'''''Sort''''']] | + | <nowiki>[[</nowiki>{{ns:category}}:'''''Name'''''|'''''Sort''''']] |
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− | + | Sort keys are case-sensitive, and spaces and other characters are also valid. The order of the sections within a category follows the Unicode sort order. The sort key does not change the page title displayed in the category. | |
− | See [[ | + | See [[Help:Sorting]] for further information on category sorting. |
==Creating a category page== | ==Creating a category page== | ||
Categories exist even if their page has not been created, but these categories are isolated from others and serve little purpose for organization or navigation. | Categories exist even if their page has not been created, but these categories are isolated from others and serve little purpose for organization or navigation. | ||
− | A category is created by creating a page in the '''''Category:''''' namespace. A category page can be created the same way as other wiki pages; just add "<code>{{ns:category}}:</code>" before the page title. | + | A category is created by creating a page in the '''''Category:''''' namespace. A category page can be created the same way as other wiki pages (see [[Help:Starting a new page]]); just add "<code>{{ns:category}}:</code>" before the page title. |
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− | To avoid extra work, try | + | To avoid extra work, try searching within your wiki before creating a new category. The list of all categories can be found in "{{int:specialpages}}" in the "{{lcfirst:{{int:toolbox}}}}" box of the [[Help:Navigation#Sidebar|sidebar]]. |
− | Unlike other wiki pages, it is ''not'' possible to rename (move) a category. | + | Unlike other wiki pages, it is ''not'' possible to rename (move) a category. It is necessary to create a new category and change the {{ns:category}} tag on every page. The new category will ''not'' have the older category's page history, which is undesirable if there are many revisions. |
==Managing the category hierarchy== | ==Managing the category hierarchy== |