How to use the opcua.ua.QualifiedName function in opcua

def test_server_node(self):
        node = self.opc.get_server_node()
        self.assertEqual(ua.QualifiedName('Server', 0), node.get_browse_name())

def test_add_string_array_variable(self):
        objects = self.opc.get_objects_node()
        v = objects.add_variable('ns=3;s=stringarrayid;', '9:stringarray', ['l', 'b'])
        nid = ua.NodeId('stringarrayid', 3)
        qn = ua.QualifiedName('stringarray', 9)
        self.assertEqual(nid, v.nodeid)
        self.assertEqual(qn, v.get_browse_name())
        val = v.get_value()
        self.assertEqual(['l', 'b'], val)

def test_add_string_array_variable(self):
        objects = self.opc.get_objects_node()
        v = objects.add_variable('ns=3;s=stringarrayid;', '9:stringarray', ['l', 'b'])
        nid = ua.NodeId('stringarrayid', 3)
        qn = ua.QualifiedName('stringarray', 9)
        self.assertEqual(nid, v.nodeid)
        self.assertEqual(qn, v.get_browse_name())
        val = v.get_value()
        self.assertEqual(['l', 'b'], val)

attrs.EventNotifier = 0
    node.NodeAttributes = attrs
    server.add_nodes([node])
    refs = []
    ref = ua.AddReferencesItem()
    ref.IsForward = True
    ref.ReferenceTypeId = ua.NodeId.from_string("i=39")
    ref.SourceNodeId = ua.NodeId.from_string("i=591")
    ref.TargetNodeClass = ua.NodeClass.DataType
    ref.TargetNodeId = ua.NodeId.from_string("i=7935")
    refs.append(ref)
    server.add_references(refs)
   
    node = ua.AddNodesItem()
    node.RequestedNewNodeId = ua.NodeId.from_string("i=594")
    node.BrowseName = ua.QualifiedName.from_string("Default Binary")
    node.NodeClass = ua.NodeClass.Object
    node.ParentNodeId = ua.NodeId.from_string("i=592")
    node.ReferenceTypeId = ua.NodeId.from_string("i=38")
    node.TypeDefinition = ua.NodeId.from_string("i=76")
    attrs = ua.ObjectAttributes()
    attrs.DisplayName = ua.LocalizedText("Default Binary")
    attrs.EventNotifier = 0
    node.NodeAttributes = attrs
    server.add_nodes([node])
    refs = []
    ref = ua.AddReferencesItem()
    ref.IsForward = True
    ref.ReferenceTypeId = ua.NodeId.from_string("i=39")
    ref.SourceNodeId = ua.NodeId.from_string("i=594")
    ref.TargetNodeClass = ua.NodeClass.DataType
    ref.TargetNodeId = ua.NodeId.from_string("i=7938")

# create data type node
        dt_node = ua.AddNodesItem()
        dt_node.RequestedNewNodeId = data_type_node_id
        dt_node.BrowseName = ua.QualifiedName(name, self._idx)
        dt_node.NodeClass = ua.NodeClass.DataType
        dt_node.ParentNodeId = ua.NodeId(ua.ObjectIds.Structure, 0)
        dt_node.ReferenceTypeId = ua.NodeId(ua.ObjectIds.HasSubtype, 0)
        dt_attributes = ua.DataTypeAttributes()
        dt_attributes.DisplayName = ua.LocalizedText(type_name)
        dt_node.NodeAttributes = dt_attributes

        # create description node
        desc_node = ua.AddNodesItem()
        desc_node.RequestedNewNodeId = description_node_id
        desc_node.BrowseName = ua.QualifiedName(name, self._idx)
        desc_node.NodeClass = ua.NodeClass.Variable
        desc_node.ParentNodeId = self.dict_id
        desc_node.ReferenceTypeId = ua.NodeId(ua.ObjectIds.HasComponent, 0)
        desc_node.TypeDefinition = ua.NodeId(ua.ObjectIds.DataTypeDescriptionType, 0)
        desc_attributes = ua.VariableAttributes()
        desc_attributes.DisplayName = ua.LocalizedText(type_name)
        desc_attributes.DataType = ua.NodeId(ua.ObjectIds.String)
        desc_attributes.Value = ua.Variant(name, ua.VariantType.String)
        desc_attributes.ValueRank = -1
        desc_node.NodeAttributes = desc_attributes

        # create object node which the loaded python class should link to
        obj_node = ua.AddNodesItem()
        obj_node.RequestedNewNodeId = bind_obj_node_id
        obj_node.BrowseName = ua.QualifiedName('Default Binary', 0)
        obj_node.NodeClass = ua.NodeClass.Object

attrs.EventNotifier = 0
    node.NodeAttributes = attrs
    server.add_nodes([node])
    refs = []
    ref = ua.AddReferencesItem()
    ref.IsForward = True
    ref.ReferenceTypeId = ua.NodeId.from_string("i=39")
    ref.SourceNodeId = ua.NodeId.from_string("i=542")
    ref.TargetNodeClass = ua.NodeClass.DataType
    ref.TargetNodeId = ua.NodeId.from_string("i=12721")
    refs.append(ref)
    server.add_references(refs)
   
    node = ua.AddNodesItem()
    node.RequestedNewNodeId = ua.NodeId.from_string("i=333")
    node.BrowseName = ua.QualifiedName.from_string("Default Binary")
    node.NodeClass = ua.NodeClass.Object
    node.ParentNodeId = ua.NodeId.from_string("i=331")
    node.ReferenceTypeId = ua.NodeId.from_string("i=38")
    node.TypeDefinition = ua.NodeId.from_string("i=76")
    attrs = ua.ObjectAttributes()
    attrs.DisplayName = ua.LocalizedText("Default Binary")
    attrs.EventNotifier = 0
    node.NodeAttributes = attrs
    server.add_nodes([node])
    refs = []
    ref = ua.AddReferencesItem()
    ref.IsForward = True
    ref.ReferenceTypeId = ua.NodeId.from_string("i=39")
    ref.SourceNodeId = ua.NodeId.from_string("i=333")
    ref.TargetNodeClass = ua.NodeClass.DataType
    ref.TargetNodeId = ua.NodeId.from_string("i=7686")

def _add_dictionary(self, name):
        dictionary_node_id = self._nodeid_generator()
        node = ua.AddNodesItem()
        node.RequestedNewNodeId = dictionary_node_id
        node.BrowseName = ua.QualifiedName(name, self._idx)
        node.NodeClass = ua.NodeClass.Variable
        node.ParentNodeId = ua.NodeId(ua.ObjectIds.OPCBinarySchema_TypeSystem, 0)
        node.ReferenceTypeId = ua.NodeId(ua.ObjectIds.HasComponent, 0)
        node.TypeDefinition = ua.NodeId(ua.ObjectIds.DataTypeDictionaryType, 0)
        attrs = ua.VariableAttributes()
        attrs.DisplayName = ua.LocalizedText(name)
        attrs.DataType = ua.NodeId(ua.ObjectIds.ByteString)
        # Value should be set after all data types created by calling set_dict_byte_string
        attrs.Value = ua.Variant(None, ua.VariantType.Null)
        attrs.ValueRank = -1
        node.NodeAttributes = attrs
        self._session_server.add_nodes([node])

        return dictionary_node_id

ref.SourceNodeId = ua.NodeId.from_string("i=12089")
    ref.TargetNodeClass = ua.NodeClass.DataType
    ref.TargetNodeId = ua.NodeId.from_string("i=12091")
    refs.append(ref)
    ref = ua.AddReferencesItem()
    ref.IsForward = True
    ref.ReferenceTypeId = ua.NodeId.from_string("i=40")
    ref.SourceNodeId = ua.NodeId.from_string("i=12089")
    ref.TargetNodeClass = ua.NodeClass.DataType
    ref.TargetNodeId = ua.NodeId.from_string("i=76")
    refs.append(ref)
    server.add_references(refs)
   
    node = ua.AddNodesItem()
    node.RequestedNewNodeId = ua.NodeId.from_string("i=12090")
    node.BrowseName = ua.QualifiedName.from_string("Default Binary")
    node.NodeClass = ua.NodeClass.Object
    node.ParentNodeId = ua.NodeId.from_string("i=12080")
    node.ReferenceTypeId = ua.NodeId.from_string("i=38")
    node.TypeDefinition = ua.NodeId.from_string("i=76")
    attrs = ua.ObjectAttributes()
    attrs.DisplayName = ua.LocalizedText("Default Binary")
    attrs.EventNotifier = 0
    node.NodeAttributes = attrs
    server.add_nodes([node])
    refs = []
    ref = ua.AddReferencesItem()
    ref.IsForward = False
    ref.ReferenceTypeId = ua.NodeId.from_string("i=38")
    ref.SourceNodeId = ua.NodeId.from_string("i=12090")
    ref.TargetNodeClass = ua.NodeClass.DataType
    ref.TargetNodeId = ua.NodeId.from_string("i=12080")

attrs.EventNotifier = 0
    node.NodeAttributes = attrs
    server.add_nodes([node])
    refs = []
    ref = ua.AddReferencesItem()
    ref.IsForward = True
    ref.ReferenceTypeId = NumericNodeId(40, 0)
    ref.SourceNodeId = NumericNodeId(11305, 0)
    ref.TargetNodeClass = NodeClass.DataType
    ref.TargetNodeId = NumericNodeId(2340, 0)
    refs.append(ref)
    server.add_references(refs)
   
    node = ua.AddNodesItem()
    node.RequestedNewNodeId = NumericNodeId(11306, 0)
    node.BrowseName = QualifiedName('MaximumActualTime2', 0)
    node.NodeClass = NodeClass.Object
    node.TypeDefinition = NumericNodeId(2340, 0)
    attrs = ua.ObjectAttributes()
    attrs.Description = LocalizedText("Retrieve the maximum value with the actual timestamp including the Simple Bounding Values.")
    attrs.DisplayName = LocalizedText("MaximumActualTime2")
    attrs.EventNotifier = 0
    node.NodeAttributes = attrs
    server.add_nodes([node])
    refs = []
    ref = ua.AddReferencesItem()
    ref.IsForward = True
    ref.ReferenceTypeId = NumericNodeId(40, 0)
    ref.SourceNodeId = NumericNodeId(11306, 0)
    ref.TargetNodeClass = NodeClass.DataType
    ref.TargetNodeId = NumericNodeId(2340, 0)
    refs.append(ref)

attrs.EventNotifier = 0
    node.NodeAttributes = attrs
    server.add_nodes([node])
    refs = []
    ref = ua.AddReferencesItem()
    ref.IsForward = True
    ref.ReferenceTypeId = NumericNodeId(40, 0)
    ref.SourceNodeId = NumericNodeId(11428, 0)
    ref.TargetNodeClass = NodeClass.DataType
    ref.TargetNodeId = NumericNodeId(2340, 0)
    refs.append(ref)
    server.add_references(refs)
   
    node = ua.AddNodesItem()
    node.RequestedNewNodeId = NumericNodeId(11429, 0)
    node.BrowseName = QualifiedName('VariancePopulation', 0)
    node.NodeClass = NodeClass.Object
    node.TypeDefinition = NumericNodeId(2340, 0)
    attrs = ua.ObjectAttributes()
    attrs.Description = LocalizedText("Retrieve the variance for the interval as calculated by the StandardDeviationPopulation which includes Simple Bounding Values.")
    attrs.DisplayName = LocalizedText("VariancePopulation")
    attrs.EventNotifier = 0
    node.NodeAttributes = attrs
    server.add_nodes([node])
    refs = []
    ref = ua.AddReferencesItem()
    ref.IsForward = True
    ref.ReferenceTypeId = NumericNodeId(40, 0)
    ref.SourceNodeId = NumericNodeId(11429, 0)
    ref.TargetNodeClass = NodeClass.DataType
    ref.TargetNodeId = NumericNodeId(2340, 0)
    refs.append(ref)