/usr/share/gnubg/met/met.dtd is in gnubg-data 1.04.000-1.
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 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | <!--
met.dtd
by Joern Thyssen <jthyssen@dk.ibm.com>, 2002
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 3 of the License, or
(at your option) any later version.
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.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
$Id: met.dtd,v 1.4 2013/08/21 03:45:23 mdpetch Exp $
-->
<!ELEMENT met (info,pre-crawford-table,post-crawford-table+)>
<!ELEMENT info (name,description,length)>
<!ELEMENT name (#PCDATA)>
<!ELEMENT description (#PCDATA)>
<!ELEMENT length (#PCDATA)>
<!ELEMENT pre-crawford-table (row*|parameters)>
<!ATTLIST pre-crawford-table type CDATA #IMPLIED>
<!ELEMENT post-crawford-table (row|parameters)>
<!ATTLIST post-crawford-table type CDATA #IMPLIED
player CDATA #IMPLIED>
<!ELEMENT row (me)*>
<!ELEMENT me (#PCDATA)>
<!ELEMENT parameters (parameter*)>
<!ELEMENT parameter (#PCDATA)>
<!ATTLIST parameter name CDATA #REQUIRED>
|