Helper that merges core, extended and custom properties

        :return: mapping of all properties

def allProperties(self):
        """Helper that merges core, extended and custom properties

        :return: mapping of all properties
        """
        rval = {}
        rval.update(self.coreProperties)
        rval.update(self.extendedProperties)
        rval.update(self.customProperties)
        return rval