Peer Interface

<!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.freedesktop.DBus.Peer">
		<method name="Ping" />
        <method name="GetMachineId">
            <arg type="s" direction="out"/>
        </method>
    </interface>
</node>