Template:BOOKNAME/category
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This subtemplate of {{BOOKNAME}} handles for {{BOOKNAME/core}} the case of category namespace.
Usage
The two parameters expected are namespace and pagename.
Internals
At this writing, the associated book name for a category is derived from the pagename by stripping an optional Book: prefix and treating the result as the full name (with namespace) of an in-book page, delegating through {{BOOKNAME/refactor}} to {{BOOKNAME/inbook}}.
If the Book: prefix is missing, by not stripping the category name's first five characters, it is treated as an old-style book-category name.