Wikipedia:WikiProject Aviation/Style guide/Categories
Categories
Overview
- An alternate to this scheme is currently drafted at Wikipedia:WikiProject Aircraft/Categories/Proposed update.
The category scheme originates in one root category—Category:Aviation—and can be thought of as a tree structure. A guide to the top-level sub-categories of this category is presented below; for brevity, a number of categories that are rarely used or lie outside the scope of this project have been omitted.
- Category:Aviation
- Root category for matters related to aviation. This category should be empty of articles,
- Category:Aerobatics
- Root category for all topics related to aerobatics.
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General principles
Naming
- For naming conventions related to categories, see the section on naming conventions above.
Most specific categories
In general, articles and categories should be placed in the most specific applicable categories, and should not be placed directly in a "parent" category if they are already present in one of its sub-categories. In other words, if an article is placed in Category:United States airliners 1940-1949, there is no need to place it in Category:United States civil aircraft 1940-1949 or Category:Aircraft manufactured by the United States as well.
Note, however, that this applies only to direct placement into a "parent" category; it is normal for a category to have multiple indirect paths up to some other category higher in the tree. For example, Category:United States military transport aircraft 1940-1949 is both a sub-category of Category:Military transport aircraft 1940-1949 (which is a sub-category of Category:Military aircraft 1940-1949) and a sub-category of Category:United States military aircraft 1940-1949 (which is also a sub-category Category:Military aircraft 1940-1949); thus, there are two distinct paths from Category:United States military transport aircraft 1940-1949 up to Category:Military aircraft 1940-1949. This is especially common when dealing with intersection categories.
Nested categories
![[icon]](/enwiki/wiki/File:Wiki_letter_w_cropped.svg){kind=small} | This section needs expansion. You can help by adding to it. (July 2009) |
Intersection categories
| This section needs expansion. You can help by adding to it. (July 2009) |
Aircraft
| This section needs expansion. You can help by adding to it. (July 2009) |
Airlines
| This section needs expansion. You can help by adding to it. (July 2009) |
Airports
Airport articles should include the most specific category possible based on location. Each country has its own airport category, which can be found at Category: Airports by country (also available grouped by continent at Category: Airports by continent). For example, Copenhagen Airport in Denmark includes Category: Airports in Denmark.
Some larger countries have sub-categories for first level administrative divisions, such as state or province. These can be found under the country's airport category and should be used where available. For example, Québec City Jean Lesage International Airport in the Canadian province of Quebec includes Category: Airports in Quebec, a sub-category of Category: Airports in Canada (which is not added to the article).
Airport articles often include a location category for an administrative division below that of the airport category. For example, Nice Côte d'Azur Airport in Nice, France, includes both Category: Airports in France and Category: Nice.
Besides the location related categories, some airport articles may include other categories, such as those listed at Category: Airports by type. For example, Independence State Airport in the U.S. state of Oregon includes Category: Residential airparks in addition to Category: Airports in Oregon and Category: Polk County, Oregon.