This page (template), presents on a few Wikisource projects (br, en, fr, ru, ...), is not called in the file PagesTagParser.php. Maybe in a very old version in 2010.

This file could be useful to add some contents at the end of the transclusion. For example the chapters navigation block, or a HTML element opened in MediaWiki:Proofreadpage_header_template that wraps only the transclusion contents (without header).