/usr/share/doc/music-hub/html/classcom_1_1ubuntu_1_1music_1_1Track__coll__graph.dot is in libmusic-hub-doc 0.0+13.10.20130920-0ubuntu1.
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 | digraph "com::ubuntu::music::Track"
{
// INTERACTIVE_SVG=YES
bgcolor="transparent";
edge [fontname="Helvetica",fontsize="10",labelfontname="Helvetica",labelfontsize="10"];
node [fontname="Helvetica",fontsize="10",shape=record];
Node1 [label="{com::ubuntu::music\l::Track\n||+ Track()\l+ ~Track()\l+ operator=()\l+ operator==()\l+ uri()\l+ meta_data()\l+ on_meta_data_changed()\l}",height=0.2,width=0.4,color="black", fillcolor="grey75", style="filled" fontcolor="black"];
}
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