/usr/share/wireshark/dtds/xcap-caps.dtd is in libwireshark-data 2.4.5-1.
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 | <? wireshark:protocol
proto_name="xcap-caps"
description="XML Configuration Access Protocol Server Capabilities"
hierarchy="yes" ?>
<!ELEMENT xcap-caps ((auid?)*, extension?, (namespace?)*) >
<!ELEMENT auid (#PCDATA)>
<!ELEMENT extension (#PCDATA)>
<!ELEMENT namespace (#PCDATA)>
|