Parse an xml.dom Node object representing a condition into this
        object.

def parse_xml_node(self, node):
        '''Parse an xml.dom Node object representing a condition into this
        object.

        '''
        self.sequence = int(node.getAttributeNS(RTS_NS, 'sequence'))
        c = node.getElementsByTagNameNS(RTS_NS, 'TargetComponent')
        if c.length != 1:
            raise InvalidParticipantNodeError
        self.target_component = TargetExecutionContext().parse_xml_node(c[0])
        for c in get_direct_child_elements_xml(node, prefix=RTS_EXT_NS,
                                               local_name='Properties'):
            name, value = parse_properties_xml(c)
            self._properties[name] = value
        return self