This file is indexed.

/usr/share/dbus-1/interfaces/org.kde.Phonon.AudioOutput.xml is in libphonon-dev 4:4.7.0really4.6.0-0ubuntu1.

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

The actual contents of the file can be viewed below.

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<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN" "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">
<node>
  <interface name="org.kde.Phonon.AudioOutput">
    <property name="volume" type="d" access="readwrite"/>
    <property name="muted" type="b" access="readwrite"/>
    <property name="outputDeviceIndex" type="i" access="readwrite"/>
    <signal name="volumeChanged">
      <arg type="d" direction="out"/>
    </signal>
    <signal name="mutedChanged">
      <arg type="b" direction="out"/>
    </signal>
    <signal name="outputDeviceIndexChanged">
      <arg type="i" direction="out"/>
    </signal>
    <signal name="nameChanged">
      <arg name="newName" type="s" direction="out"/>
    </signal>
    <signal name="newOutputAvailable">
      <arg name="service" type="s" direction="out"/>
      <arg name="path" type="s" direction="out"/>
    </signal>
    <signal name="outputDestroyed">
    </signal>
    <method name="category">
      <arg type="s" direction="out"/>
    </method>
    <method name="name">
      <arg type="s" direction="out"/>
    </method>
  </interface>
</node>