@Override
            protected Node createNode(SourceLocation location) {
                return new NullNode(location);
            }
Parse a Node identifier String, taking into account keywords and forward references.

@param loader     IDL parser.
@param identifier Identifier to parse.
@param location   Source location to assign to the identifier.
@return Returns the parsed identifier.
smithy-model/src/main/java/software/amazon/smithy/model/loader/IdlNodeParser.java