This file is indexed.

/usr/share/avahi/avahi-service.dtd is in avahi-daemon 0.6.30-5ubuntu2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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<!ELEMENT service-group (name,service+)>
<!ATTLIST service-group>
<!ELEMENT name (#PCDATA)>
<!ATTLIST name replace-wildcards (yes|no) "no">
<!ELEMENT service (type,subtype*,domain-name?,host-name?,port,txt-record*)>
<!ATTLIST service protocol (ipv4|ipv6|any) "any">
<!ELEMENT type (#PCDATA)>
<!ATTLIST type>
<!ELEMENT subtype (#PCDATA)>
<!ATTLIST subtype>
<!ELEMENT domain-name (#PCDATA)>
<!ATTLIST domain-name>
<!ELEMENT host-name (#PCDATA)>
<!ATTLIST host-name>
<!ELEMENT port (#PCDATA)>
<!ATTLIST port>
<!ELEMENT txt-record (#PCDATA)>
<!ATTLIST txt-record>