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/usr/share/empathy/empathy-contact-groups.dtd is in empathy-common 3.4.2.3-2+deb7u1.

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<!--
  DTD for Empathys contact groups.
  by Martyn Russell <mr@gnome.org>
-->

<!-- Root element. -->
<!ELEMENT contacts (account)>

<!ELEMENT account (group)+>
<!ATTLIST account 
	name CDATA #REQUIRED>

<!-- Groups in the roster. -->
<!ELEMENT group EMPTY>
<!ATTLIST group
   name CDATA #REQUIRED
   expanded CDATA #REQUIRED>