This file is indexed.

/usr/share/dbus-1/interfaces/com.canonical.Unity.Screen.xml is in unity-system-compositor 0.4.3+16.04.20160323-0ubuntu1.

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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='com.canonical.Unity.Screen'>
    <method name='setScreenPowerMode'>
      <arg type='b' direction='out'/>
      <arg name='mode' type='s' direction='in'/>
      <arg name='reason' type='i' direction='in'/>
    </method>
    <method name='keepDisplayOn'>
      <arg type='i' direction='out'/>
    </method>
    <method name='removeDisplayOnRequest'>
      <arg name='id' type='i' direction='in'/>
    </method>
    <method name='setUserBrightness'>
      <arg name='brightness' type='i' direction='in'/>
    </method>
    <method name='userAutobrightnessEnable'>
      <arg name='enable' type='b' direction='in'/>
    </method>
    <method name='setInactivityTimeouts'>
      <arg name='poweroff_timeout' type='i' direction='in'/>
      <arg name='dimmer_timeout' type='i' direction='in'/>
    </method>
    <method name='setTouchVisualizationEnabled'>
      <arg name='enabled' type='b' direction='in'/>
    </method>
  </interface>
</node>