/usr/share/empathy/empathy-chatroom-manager.dtd is in empathy-common 3.8.6-0ubuntu9.
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 | <!--
DTD for Empathys Chat Rooms.
by Martyn Russell <martyn@imendio.com>
v0.2
-->
<!-- Root element. -->
<!ELEMENT chatrooms (chatroom*)>
<!ELEMENT chatroom
(name,room,account,(auto_connect?),(always_urgent?))>
<!ELEMENT name (#PCDATA)>
<!ELEMENT room (#PCDATA)>
<!ELEMENT auto_connect (#PCDATA)>
<!ELEMENT always_urgent (#PCDATA)>
<!ELEMENT account (#PCDATA)>
|