/usr/share/discover/dtd/discover.dtd is in libdiscover2 2.1.2-7.
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 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 | <!-- $Progeny$ -->
<!ELEMENT discover-data (location)*>
<!ELEMENT location EMPTY>
<!ATTLIST location bus NMTOKEN #REQUIRED
type NMTOKEN #REQUIRED
url CDATA #REQUIRED>
<!ELEMENT busclass_list (busclass)*>
<!ATTLIST busclass_list bus NMTOKEN #REQUIRED>
<!ELEMENT busclass EMPTY>
<!ATTLIST busclass id NMTOKEN #REQUIRED
name NMTOKEN #REQUIRED>
<!ELEMENT vendor_list (vendor)*>
<!ATTLIST vendor_list bus NMTOKEN #REQUIRED>
<!ELEMENT vendor EMPTY>
<!ATTLIST vendor id CDATA #REQUIRED
name CDATA #REQUIRED>
<!ELEMENT device_list (device)*>
<!ATTLIST device_list bus NMTOKEN #REQUIRED>
<!ELEMENT device (data)*>
<!ATTLIST device busclass NMTOKEN #REQUIRED
model CDATA #DEFAULT default
model_name CDATA #REQUIRED
vendor CDATA #REQUIRED>
<!ELEMENT data (#PCDATA|data)*>
<!ATTLIST data class NMTOKEN #REQUIRED
version CDATA #IMPLIED>
<!-- vim:set ai et sts=8 sw=8 tw=0: -->
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