Revision control
++ <!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN"
++ <node>
++ <interface name="net.hadess.SensorProxy.Compass">
++ <method name="ClaimCompass">
++ </method>
++ <method name="ReleaseCompass">
++ </method>
++ <property type="b" name="HasCompass" access="read">
++ </property>
++ <property type="d" name="CompassHeading" access="read">
++ </property>
++ </interface>
++ </node>