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The text that describes the semantics of the delete primitive operation (section 3.2.2 point 2.e) assumes that a deleted node always has a parent. This might not be true, so the text should reflect such a possibility.
The specification has been clarified to handle this case. If a node to be deleted has no parent, no change is made to the data model instance, and it is implementation-defined whether error XUDY0020 is raised.