This file is indexed.

/usr/share/dbus-1/interfaces/com.canonical.Unity.Greeter.Broadcast.xml is in unity-greeter-session-broadcast 0.1+14.10.20140601-0ubuntu2.

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

The actual contents of the file can be viewed below.

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<?xml version="1.0" encoding="UTF-8"?>
<node>
	<interface name="com.canonical.Unity.Greeter.Broadcast">
		<!-- From the Greeter -->
		<method name="RequestUrlStart">
			<arg type="s" name="username" direction="in" />
			<arg type="s" name="url" direction="in" />
		</method>

		<method name="RequestHomeShown">
			<arg type="s" name="username" direction="in" />
		</method>

		<method name="RequestSoundPlayPause">
			<arg type="s" name="username" direction="in" />
		</method>

		<method name="RequestSoundNext">
			<arg type="s" name="username" direction="in" />
		</method>

		<method name="RequestSoundPrev">
			<arg type="s" name="username" direction="in" />
		</method>

		<!-- To the Session -->
		<signal name="StartUrl">
			<arg type="s" name="username" direction="out" />
			<arg type="s" name="url" direction="out" />
		</signal>

		<signal name="ShowHome">
			<arg type="s" name="username" direction="out" />
		</signal>

		<signal name="SoundPlayPause">
			<arg type="s" name="username" direction="out" />
		</signal>

		<signal name="SoundNext">
			<arg type="s" name="username" direction="out" />
		</signal>

		<signal name="SoundPrev">
			<arg type="s" name="username" direction="out" />
		</signal>

		<!-- Other -->
	</interface>
</node>