This file is indexed.

/usr/share/dtds/jack_rack_1.3.dtd is in jack-rack 1.4.8~rc1-2ubuntu1.

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 jackrack        (channels, samplerate, plugin*)>
<!ELEMENT channels        (#PCDATA)>
<!ELEMENT samplerate      (#PCDATA)>

<!ELEMENT plugin          (id, enabled, wet_dry_enabled, wet_dry_locked?,
                           wet_dry_values, lockall?, controlrow*, midi_control*)>
<!ELEMENT id              (#PCDATA)>
<!ELEMENT enabled         (#PCDATA)>
<!ELEMENT wet_dry_enabled (#PCDATA)>
<!ELEMENT wet_dry_locked  (#PCDATA)>
<!ELEMENT lockall         (#PCDATA)>

<!ELEMENT wet_dry_values  (value+)>

<!ELEMENT midi_control    (midi_channel, midi_param, min_value, max_value, (ladspa | wet_dry))>
<!ELEMENT midi_channel    (#PCDATA)>
<!ELEMENT midi_param      (#PCDATA)>
<!ELEMENT min_value       (#PCDATA)>
<!ELEMENT max_value       (#PCDATA)>

<!ELEMENT ladspa          (copy, control)>
<!ELEMENT copy            (#PCDATA)>
<!ELEMENT control         (#PCDATA)>

<!ELEMENT wet_dry         (channel)>
<!ELEMENT channel         (#PCDATA)>

<!ELEMENT controlrow      (lock?, value*)>
<!ELEMENT lock            (#PCDATA)>
<!ELEMENT value           (#PCDATA)>