Synonym for Section or Chapter.
All Posts are placed into one or several Categories. A Main category is always required. Additional categories are called Extra categories.
Categories can be organized into hierarchies of Sub Categories with an infinite nesting level.
- Since it is impossible to place a Post into a Collection without going through a Category, all new collections are created with at least one default category, which may be called "Uncategorized". Without this category it would be impossible to place a Post into the collection.
- Even if you configure b2evolution not to display radio buttons for the main category, a main category will always be assigned internally.
- The main category is also always considered as an extra category internally. Therefore, selecting a main category through a radio button will also check the extra-category checkbox. Doing this allows for faster database requests when finding the posts that belong to a specific category or even a specific collection.
Comment from: fplanque
It’s just a detail, but could you please explain in the manual why the extra category is always selected along with the main category? When something is in a certain main cat, it doesn’t require the same extra cat, does it?