/usr/share/polymake/xml/datafile.rng is in polymake-common 3.2r2-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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<!--
Copyright (c) 1997-2018
Ewgenij Gawrilow, Michael Joswig (Technische Universitaet Berlin, Germany)
http://www.polymake.org
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version: http://www.gnu.org/licenses/gpl.txt.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
===============================================================================
Relax-NG Schema for polymake v3 data file
-->
<grammar xmlns="http://relaxng.org/ns/structure/1.0"
datatypeLibrary="http://www.w3.org/2001/XMLSchema-datatypes"
xmlns:note="http://www.math.tu-berlin.de/polymake/note"
ns="http://www.math.tu-berlin.de/polymake/#3">
<include href="common_grammar.rng" />
<start>
<choice>
<ref name="TopObject" />
<ref name="LooseData" />
</choice>
</start>
<define name="TopObject">
<element name="object">
<ref name="TopAttribs" />
<ref name="ObjectContent" />
</element>
</define>
<define name="TopAttribs">
<note:a> type prefixed by an application name </note:a>
<attribute name="type">
<data type="string">
<param name="pattern">[a-zA-Z][a-zA-Z_0-9]*::.*</param>
</data>
</attribute>
<note:a>
version refers to the polymake implementation which has
created this data instance.
</note:a>
<optional>
<attribute name="version">
<data type="string">
<param name="pattern">\d+(\.\d+)*</param>
</data>
</attribute>
</optional>
</define>
<define name="LooseData">
<element name="data">
<ref name="TopAttribs" />
<ref name="Extensions" />
<optional>
<element name="description">
<text/>
</element>
</optional>
<ref name="PropertyData" />
</element>
</define>
</grammar>
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