Template:BookCat

This template puts the page on which it's used ({{FULLPAGENAME}}) into appropriate categories, based on certain page-naming and page-categorization conventions.

When used without parameters, it

• places subpages of a book in the book's category (Category:{{ROOTBOOKNAME}}) and sorts them by chapter name.
• places a book's templates in the book's template category (Category:{{ROOTBOOKNAME}}/Templates). This only works if a book's templates begin with  Template:{{ROOTBOOKNAME}} .
• places a book's template category in the book's category and in  Category:Book-specific templates .
• places any other category in its parent, sorted by the category's last name. The parent has the same name except removing everything from the last slash on; and the last name is the part that was removed after that last slash. For example, Category:My Book/Images  would go in  Category:My Book  with sort key  Images .

Optional parameter  filing=deep  changes the behavior on book pages, so that a book page with more than one slash in its name is placed in a subcategory of the category where its parent page would be placed, sorted by the page's last name. For example, using  {{BookCat|filing=deep}}  on page  My Book/Maps/Asia  would put that page in  Category:My Book/Maps  with sort key  Asia .

Optional parameter  template-filing=deep  changes the behavior on template pages to deep filing (so  Template:My book/Maps/Asia  would go in  Category:My book/Templates/Maps).

See Using Wikibooks/Subjects, Categories, and Classifications#Deep filing (advanced) for more information.