Template:Shelf:Ancestry?/doc

Usage
This template takes one unnamed parameter, and looks for an ancestry page for a shelf with that name. Returns non-blank only if the ancestry page exists and is apparently properly set up.

Internals
This template pings the ancestry page, and checks for the correct response by Shelf:Ancestry. The correct ping response cannot result if the ancestry page doesn't exist, and is wildly unlikely if the ancestry page isn't properly set up. This template does not use the  magic word.