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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

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

        '''
        self.connector_id = node.getAttributeNS(RTS_NS, 'connectorId')
        self.name = node.getAttributeNS(RTS_NS, 'name')
        if node.hasAttributeNS(RTS_NS, 'transMethod'):
            self.trans_method = node.getAttributeNS(RTS_NS,
                                                         'transMethod')
        else:
            self.trans_method = ''
        self.comment = node.getAttributeNS(RTS_EXT_NS, 'comment')
        if node.hasAttributeNS(RTS_EXT_NS, 'visible'):
            visible = node.getAttributeNS(RTS_EXT_NS, 'visible')
            if visible == 'true' or visible == '1':
                self.visible = True
            else:
                self.visible = False

        if node.getElementsByTagNameNS(RTS_NS, 'sourceServicePort').length != 1:
            raise InvalidServicePortConnectorNodeError
        self.source_service_port = TargetPort().parse_xml_node(\
                node.getElementsByTagNameNS(RTS_NS, 'sourceServicePort')[0])
        if node.getElementsByTagNameNS(RTS_NS, 'targetServicePort').length != 1:
            raise InvalidServicePortConnectorNodeError
        self.target_service_port = TargetPort().parse_xml_node(\
                node.getElementsByTagNameNS(RTS_NS, 'targetServicePort')[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