Opc.Ua.Server.CoreNodeManager.CreateReferenceType C# (CSharp) Method

        public NodeId CreateReferenceType(
            NodeId         parentId,
            NodeId         nodeId,
            QualifiedName  browseName,
            LocalizedText  displayName,
            LocalizedText  description,
            uint           writeMask,
            uint           userWriteMask,
            LocalizedText  inverseName,
            bool           isAbstract,
            bool           symmetric)
        {
            try
            {
                m_lock.Enter();
    
                // check for null node id.
                if (NodeId.IsNull(nodeId))
                {
                    nodeId = CreateUniqueNodeId();
                }

                // check if node id exists.
                if (m_nodes.Exists(nodeId))
                {
                    throw ServiceResultException.Create(StatusCodes.BadNodeIdExists, "NodeId '{0}' already exists.", nodeId);
                }

                // find parent.
                IReferenceType parent = GetManagerHandle(parentId) as IReferenceType;

                if (parent == null)
                {
                    throw ServiceResultException.Create(StatusCodes.BadParentNodeIdInvalid, "Parent node '{0}' does not exist or is not an ReferenceType.", parentId);
                }
                
                // validate reference.
                ValidateReference(parent, ReferenceTypeIds.HasSubtype, false, NodeClass.ReferenceType);

                // validate browse name.
                if (QualifiedName.IsNull(browseName))
                {
                    throw ServiceResultException.Create(StatusCodes.BadBrowseNameInvalid, "BrowseName must not be empty.");
                }

                // check that the browse name is unique.
                if (m_server.TypeTree.FindReferenceType(browseName) != null)
                {
                    throw ServiceResultException.Create(StatusCodes.BadBrowseNameInvalid, "A ReferenceType with the same BrowseName ({0}) already exists.", browseName);
                }

                // create node.
                ReferenceTypeNode node = new ReferenceTypeNode();

                node.NodeId          = nodeId;
                node.NodeClass       = NodeClass.ReferenceType;
                node.BrowseName      = browseName;
                node.DisplayName     = displayName;
                node.Description     = description;
                node.WriteMask       = writeMask;
                node.UserWriteMask   = userWriteMask;
                node.InverseName     = inverseName;
                node.IsAbstract      = isAbstract;
                node.Symmetric       = symmetric;

                if (node.DisplayName == null)
                {
                    node.DisplayName = new LocalizedText(browseName.Name);
                }

                // add reference from parent.
                AddReference(parent, ReferenceTypeIds.HasSubtype, false, node, true);
                
                // add node.
                AddNode(node);
                                
                // return the new node id.
                return node.NodeId;
            }
            finally
            {
                m_lock.Exit();
            } 
        }