/usr/share/doc/debsig-verify/policy.dtd is in debsig-verify 0.16+b2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Written by Ben Collins <bcollins@debian.org>, placed in the Public
Domain.
DTD describing Policy files for verifying signatures of .deb packages.
-->
<!ELEMENT Policy (Origin, Selection*, Verification+)>
<!ATTLIST Policy xmlns CDATA #FIXED "https://www.debian.org/debsig/1.0/">
<!ELEMENT Origin EMPTY>
<!ATTLIST Origin
Name CDATA #REQUIRED
id CDATA #REQUIRED
Description CDATA #IMPLIED>
<!ELEMENT Selection ((Required|Optional)+, Reject*)>
<!ELEMENT Verification ((Required|Optional)+, Reject*)>
<!ATTLIST Selection MinOptional CDATA #IMPLIED>
<!ATTLIST Verification MinOptional CDATA #IMPLIED>
<!ELEMENT Required EMPTY>
<!ELEMENT Optional EMPTY>
<!ELEMENT Reject EMPTY>
<!ATTLIST Required
Type CDATA #REQUIRED
File CDATA #REQUIRED
Expiry CDATA #IMPLIED
id CDATA #IMPLIED>
<!ATTLIST Optional
Type CDATA #REQUIRED
File CDATA #REQUIRED
Expiry CDATA #IMPLIED
id CDATA #IMPLIED>
<!ATTLIST Reject Type CDATA #REQUIRED>
|