|B+=Bplus
(it's been there, in one form or another, since the template was created by Avraham (talk · contribs)). If the category is deleted without first removing that parameter, Template:WikiProject Statistics will throw an error. --Redrose64 (talk) 11:57, 26 February 2014 (UTC)I'm pretty sure that we have such a basic provision in our categorisation standards, and if we don't, it's because it's so obviously applicable. Nyttend (talk) 01:53, 4 March 2014 (UTC)Pages (including category pages) are categorized according to their subject, and not to their contents, because the contents are generally not a permanent feature of the category page; in particular, you can momentarily find inappropriate contents in a category page. 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.