উইকিপিডিয়া:বিষয়শ্রেণীকরণ

Every Wikipedia page should belong to at least one category. (However, there is no need to categorize talk pages, redirects, or user pages, though these may be placed in categories where appropriate.) In addition, each categorized page should be placed in all of the most specific categories to which it logically belongs. This means that if a page belongs to a subcategory of C (or a subcategory of a subcategory of C, and so on) then it is not normally placed directly into C. For exceptions to this rule, see Non-diffusing subcategories below.

While it should typically be clear from the name of an existing category which pages it should contain, the text of the category page may sometimes provide additional information on potential category contents. One way to determine if suitable categories already exist for a particular page is to check the categories of pages concerning similar or related topics. Another way is to search existing category names as described here (top of page). Since all categories form part of a hierarchy do not add categories to pages as if they are tags.

If you're not sure where to categorise a particular page, add the {{uncategorized}} template to it—other editors (such as those monitoring Wikipedia:WikiProject Categories/uncategorized) will help find appropriate categories for it.

Articles

Categorization of articles must be verifiable. It should be clear from verifiable information in the article why it was placed in each of its categories. Use the {{Category unsourced}} template if you find an article in a category that is not shown by sources to be appropriate, or the {{Category relevant?}} template if the article gives no clear indication for inclusion in a category.

Categorization must also maintain a neutral point of view. Categorizations appear on article pages without annotations or referencing to justify or explain their addition; editors should be conscious of the need to maintain a neutral point of view when creating categories or adding them to articles. Categorizations should generally be uncontroversial; if the category's topic is likely to spark controversy, then a list article (which can be annotated and referenced) is probably more appropriate.

Particular considerations for categorizing articles:

• By convention, category declarations are placed at the end of the wikitext, but before any stub templates (which themselves transclude categories).
• The order in which categories are placed on a page is not governed by any single rule (for example, it does not need to be alphabetical, although partially alphabetical ordering can sometimes be helpful). Normally the most essential, significant categories appear first.
• An article should never be left with a non-existent (redlinked) category on it. Either the category should be created, or else the link should be removed or changed to a category that does exist.
• Categorization should not be made by the type of an article. A biographical article about a specific person, for example, does not belong in Category:Biography.
• Articles on fictional subjects should not be categorized in a manner that confuses them with real subjects.

Files/images

Category tags can be added to file/image pages of files that have been uploaded to Wikipedia. When categorized, files are not included in the count of articles in the category, but are displayed in a separate section with a thumbnail and the name for each. A category can mix articles and images, or a separate file/image category can be created. A file category is typically a subcategory of the general category about the same subject, and a subcategory of the wider category for files, Category:Wikipedia files. To categorize a new file when uploading, simply add the category tag to the upload summary.

Freely licenced files may also be uploaded to, and categorized on, Wikimedia Commons. This can be done instead of, or in addition to, uploading and categorizing on Wikipedia. Most freely licenced files will eventually be copied or moved from Wikipedia to Commons, with a mirror page remaining on Wikipedia. (For an example of one such mirror page, see here). Categories should not be added to these Wikipedia mirror pages, because doing so creates a new Wikipedia page that is subject to speedy deletion. Exceptions to this principle are made for mirror pages of images that are nominated as featured pictures and for those that appear on the Wikipedia Main Page in the Did You Know? column.

Images that are used in Wikipedia that are non-free or fair use should not appear as thumbnail images in categories. To prevent the thumbnail preview of images from appearing in a category, __NOGALLERY__ should be added to the text of the category. In such cases, the file will still appear in the category, but the actual image preview will not.

Wikipedia administrative categories