/usr/share/doc/music-hub/html/classcom_1_1ubuntu_1_1music_1_1Service__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 9 10 | digraph "com::ubuntu::music::Service"
{
// 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::Service\n||+ Service()\l+ ~Service()\l+ operator=()\l+ operator==()\l+ create_session()\l}",height=0.2,width=0.4,color="black", fillcolor="grey75", style="filled" fontcolor="black"];
Node2 -> Node1 [dir="back",color="midnightblue",fontsize="10",style="solid",arrowtail="onormal",fontname="Helvetica"];
Node2 [label="{std::enable_shared\l_from_this\<Service\>\n||}",height=0.2,width=0.4,color="grey75"];
}
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