/usr/share/gnubg/met/met.dtd is in gnubg-data 1.02.000-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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 version 3 or later of the GNU General Public License as
published by the Free Software Foundation.
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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
$Id: met.dtd,v 1.3 2007/07/03 22:05:00 c_anthon 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>
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