/usr/share/php/HTMLPurifier/ConfigSchema/schema/HTML.Parent.txt is in php-htmlpurifier 4.6.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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TYPE: string
VERSION: 1.3.0
DEFAULT: 'div'
--DESCRIPTION--
<p>
String name of element that HTML fragment passed to library will be
inserted in. An interesting variation would be using span as the
parent element, meaning that only inline tags would be allowed.
</p>
--# vim: et sw=4 sts=4
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