Note that placing such a category on the target article, with the alternative title in pipetext, does ''not'' accomplish the desired purpose, as pipetext in a category link only affects how a title is ordered alphabetically, ''not'' how it actually appears.
:*A Racial Program for the Twentieth Century is a hoax quotation by the phony author Israel Cohen. The redirect to that article, Israel Cohen (hoax), belongs in :Category:Nonexistent people used in hoaxes but the article does not.
:*Wile E. Coyote and the Road Runner is an article that covers both the cartoon and its titular characters. Categories that refer to one of the characters, but not both—such as :Category:Fictional coyotes and :Category:Fictional birds—are placed on the appropriate redirects.
Alternative names for articles
The primary function of the category system is to allow readers to browse through articles. The category system is often used like an alphabetical index. It is sometimes helpful for redirects from common alternative names to appear in the index list. Editors should consider whether alternative names should be mixed in with other names, or not. Sometimes an entirely new category is more appropriate (see ''Categorization of multiple taxonomies'' below).
Some subtopics of articles have well-known names and, over time, may expand to become separate articles. Many articles cover several topics that have been combined. This can happen following a merge of several related articles. Often there are redirects pointing to these subtopics. These redirects can be categorized. In some cases, the categories for the redirects that point to the subtopics will be different than the categories for the entire article. *''Example of similar categorization:'' :*''Butterfly vertebrae points to a subsection of Congenital vertebral anomaly – both appear in :Category:Dog health'' *''Examples of different categorization:'' :*''Prohibition in Finland (appearing in :Category:History of Finland, :Category:Finnish society, :Category:1932 in Finland, and :Category:Prohibition by country) – redirects to a subsection of Prohibition (appearing in :Category:Prohibition and :Category:Alcohol law)''
Categorization of multiple taxonomies
Some articles can be organized by more than one taxonomy. An example of this is the organization of animal and plant articles by common names and binomial name taxonomy. This is possible by categorizing the article one way and categorizing the redirect a different way. In this case, the alternative categorization of the redirect will not appear in the article unless it is manually added. *''Examples:'' :*''An example for plants is: :Category:Banksia taxa by common name and :Category:Banksia taxa by scientific name.''
Categorization of list entries
Some well-organized lists have redirects pointing at their subsections. In such cases, categorization of the redirects can be an alternative way of browsing entries in a long list. It can also provide an alphabetical listing for lists that are not organised alphabetically, such as lists organised in a chronological order. Redirects to sections of minor character lists should generally only be categorized within that fictional setting, and not in the wider fictional categories. *''Examples:'' :*'':Category:EastEnders characters provides a single alphabetical listing of both minor and major characters in the soap opera EastEnders. However, the minor character redirects should not be categorised outside the EastEnders category structure, e.g. not in :Category:Fictional characters by occupation.''
How to categorize a redirect
A redirect may be categorized in the same way as for any other page; however, when it is possible to use redirect category templates (rcats), then these should be used. For clarity, all category links should be added at the end of the page on their own lines, after the redirect target link and rcat(s). Use of a blank line between the redirect target link and all rcats and category links promotes readability of the code.
#REDIRECT Xxy Yzz Category:AaaThe ''must come first, on the top line, and must start from the left margin''. -type links may be placed ''on their own lines after the redirect target link''. Redirect category (rcat) templates, , etc., the (Rcat shell) template may be placed anywhere after the redirect ''on another line or lines'', preferably the third line for readability. Those are usually placed before (above) content categories and empty lines are left between the types for readability. The magic word can also be placed on redirects, for example, to ensure that a redirect title that begins with a person's given name will be sorted to their surname: The (Rcat shell) template may be used to group redirect categories. That template automatically senses protection levels and promotes a faster learning curve for new editors. See its documentation page and the comparison page for more information. The redirect will appear in the specified categories in a style format that is different than non-redirects (by default, redirects appear in ''italics'' type, while non-redirects do not – see Technical note below). ; Example 1 : – a redirect that targets page ''Xxy Yzz'', which uses the and rcats, and which is also sorted to article content categories ''Aaa'' and ''Bbb'', may appear as follows:
#REDIRECT Xxy Yzz Category:Aaa Category:Bbb:When the title being redirected is a person's proper name, consensus is to modify the sort key from its default action, (usually sorted by , the redirect title in this case), to instead sort it by surname. The behaviour switch is used for this; for example, on the edit page of the redirect, use , so that the page will appear alphabetized in the B's and not the G's of the various categories. Similarly, for titles beginning with a definite or indefinite article, such as "the" or "a" – for example in redirect , use , so that the page will appear alphabetically in the P's (see Wikipedia:Categorization of people#Ordering names in a category for more information). As with non-redirect pages, it should be positioned immediately before the article content categories: :: For the redirect:
#REDIRECT Caitlyn Jenner Category:Athletes (track and field) at the 1975 Pan American Games Category:Athletes (track and field) at the 1976 Summer Olympics:: ''Category:Redirects from birth names'' is a subcategory of ''Category:Redirects from former names''. Normally, the most specific subcategory is used on redirects rather than their parent categories. ;Example 2 : – a redirect to an article subsection titled "Header":
#REDIRECT Xxy Yzz#Header: ''also'', when the above shell template is used, all its contents can be entered on one line as follows:
#REDIRECT Xxy Yzz#Header: There are often very good reasons to choose to use ''Rcat shell'' rather than using rcats by themselves; these reasons are detailed on its documentation and comparison pages. ;Example 3 : – a redirect to an article that has an anchor titled "Anchor this" (see templates , , and ):
#REDIRECT Xxy Yzz#Anchor this;Example 4 : – one common redirect need to a geology page titled ''Xxy Yzz'', which uses the ''R to section'' rcat to point to the article and section where the common term is defined, and which should be in categories ''Aaa'', ''Bbb'', ''Ccc'' and ''Ddd'' (the parent article may be sorted to a few more, such as ''Eee'', ''Fff'', etc.), all of which are categories usually found in the parent article. Here is how this example would appear:
#REDIRECT Xxy Yzz#Section header;Notes :# Crucial note: If the ''Redirect category shell'' (Rcat shell) template is placed on the first line, the same line as the redirect target, there are usually unexpected and peculiar results. HTML Tidy may interfere with the templates and cause them to appear in abnormal and unexpected ways when saved. Just be careful to put these templates on the third line beginning at the far left margin of the edit screen. :# is one of several "magic words" (magic words are different from templates) in wikimarkup language. It fills in the pagename (without the namespace) of the redirect ''unless'' the pagename of the target page (without namespace) is entered as its first parameter. The first category parameter represented by (note that the colon ( : ) is used to pass parameters in magic words rather than the pipe ( | ) symbol that is used in templates) above is in fact the sort key used to group pages together in a category list. :# When the ''Redirect category shell'' (Rcat shell) template is used, each rcat can pass its own parameters, whether named or numbered, in the normal manner, and without concern for what position the rcat holds within the shell template. :# As shown above, printworthiness is an important type of sort. We are told in the style guide, "The ultimate goal of the guide is to have every redirect categorised in a standard format, as well as to have every main-namespace redirect categorised as either printworthy or unprintworthy." It is important to note that this only applies to main article namespace redirects ''and not to redirects in any other namespace''. :# For more detailed information about how to categorize redirects please see the documentation for individual rcats, and the ''Redirect category shell'' template.