/usr/share/php/HTMLPurifier/ConfigSchema/schema/HTML.Nofollow.txt is in php-htmlpurifier 4.7.0-1build1.
This file is owned by root:root, with mode 0o664.
The actual contents of the file can be viewed below.
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TYPE: bool
VERSION: 4.3.0
DEFAULT: FALSE
--DESCRIPTION--
If enabled, nofollow rel attributes are added to all outgoing links.
--# vim: et sw=4 sts=4
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