23 Mar

Commons:Categories

This section link stopped working in 2006... http://commons.wikimedia.org/w/index.php?title=Commons:Categories&diff=3041178
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Revision as of 13:20, 23 March 2013
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Example: Assume that [[:Category:Spheres]] contains only pictures of crystal balls. You must not add [[:Category:Glass]] in the category page, according to the current contents, because you can have spheres made with a great variety of materials. Normally, any picture showing a glass object would be already categorized in [[:Category:Glass]] (or in a category of its substructure). So, if the [[:Category:Spheres]] is really crowded with crystal balls pictures, it would be a better idea to create a new category page, like '''Category:Glass spheres''' or '''Category:Crystal balls''', categorized in [[:Category:Spheres]] and [[:Category:Glass]].

Example: Assume that [[:Category:Spheres]] contains only pictures of crystal balls. You must not add [[:Category:Glass]] in the category page, according to the current contents, because you can have spheres made with a great variety of materials. Normally, any picture showing a glass object would be already categorized in [[:Category:Glass]] (or in a category of its substructure). So, if the [[:Category:Spheres]] is really crowded with crystal balls pictures, it would be a better idea to create a new category page, like '''Category:Glass spheres''' or '''Category:Crystal balls''', categorized in [[:Category:Spheres]] and [[:Category:Glass]].

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Generally files should only be in the most specific category that exists for certain topic. For example files in [[:Category:Looking up the center of the Eiffel Tower]] should not also be in [[:Category:Paris]] ''(see [[#Over-categorization|over-categorization]] below)''. If you do not find a category that fits your purpose, you can create it — but carefully read the section about [[#Using Categories|using categories]] first.
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Generally files should only be in the most specific category that exists for certain topic. For example files in [[:Category:Looking up the center of the Eiffel Tower]] should not also be in [[:Category:Paris]] ''(see [[#Over-categorization|over-categorization]] below)''. If you do not find a category that fits your purpose, you can create it — but carefully read the section about [[#How to use categories|using categories]] first.

This does not mean that an image only belongs in one category; it just means that images should not be in ''redundant'' or non-specific categories. For instance, an image of a Polar Bear being rescued from an iceberg by a helicopter should be in [[:Category:Ursus maritimus]], [[:Category:Icebergs]], [[:Category:Helicopters]], and [[:Category:Search and rescue]]. It should not, however, be in [[:Category:Ursidae]] or [[:Category:Aircraft]].

This does not mean that an image only belongs in one category; it just means that images should not be in ''redundant'' or non-specific categories. For instance, an image of a Polar Bear being rescued from an iceberg by a helicopter should be in [[:Category:Ursus maritimus]], [[:Category:Icebergs]], [[:Category:Helicopters]], and [[:Category:Search and rescue]]. It should not, however, be in [[:Category:Ursidae]] or [[:Category:Aircraft]].

https://commons.wikimedia.org/w/index.php?title=Commons:Categories&diff=93137735&oldid=91957980