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==Categorization using templates==
Many [[Wikipedia:Template|templates]] include category declarations in their transcludable text, for the purpose of placing the pages containing those templates into specific categories. This technique is very commonly used for populating certain kinds of administration categories, including stub categories and maintenance categories.

However, it is recommended that articles should not be placed in ordinary ''content'' categories using templates in this way. There are many reasons for this – editors cannot see the category in the wikitext; removing or restructuring the category is made more difficult (partly because automated processes will not work); inappropriate articles and non-article pages may get added to the category; sort keys may be unavailable to be customised per category; ordering of categories on the page is less controllable; and the "incategory" [[Wikipedia:Searching|search term]] will not find such pages <ref>[[bugzilla:2285]]</ref>.

When templates are used to populate administration categories, ensure that the code cannot generate nonsensical or non-existent categories, particularly when the category name depends on a parameter. Also, see [[Wikipedia:Category suppression|Category suppression]] for ways of keeping inappropriate pages out of template-generated categories.

Category declarations in templates often use <code><nowiki>{{PAGENAME}}</nowiki></code> as the sort key, particularly if they are designed to be placed on talk pages, as this suppresses the ''Talk:'' prefix. Note that this overrides any DEFAULTSORT defined on the page.