/usr/share/php/HTMLPurifier/ConfigSchema/schema/URI.DefaultScheme.txt is in php-htmlpurifier 4.7.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | URI.DefaultScheme
TYPE: string
DEFAULT: 'http'
--DESCRIPTION--
<p>
Defines through what scheme the output will be served, in order to
select the proper object validator when no scheme information is present.
</p>
--# vim: et sw=4 sts=4
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