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`BadParentNodeIdInvalid` when importing xml with user-defined UAVariableType.

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### Problem When importing [Opc.Ua.AMLBaseTypes.NodeSet2.xml](https://github.com/OPCFoundation/UA-Nodeset/blob/master/AML/Opc.Ua.AMLBaseTypes.NodeSet2.xml), it raised **BadParentNodeIdInvalid** with information: ``` failure adding node NodeData(nodeid:NumericNodeId(ns=1;i=1010)) ``` ### Analysis The node `1010` is defined at [Line 175](https://github.com/OPCFoundation/UA-Nodeset/blob/master/AML/Opc.Ua.AMLBaseTypes.NodeSet2.xml#L175) ```xml ``` Its parent...