Failed while importing to a Graph an XML with 'same-name-sibling' elements

When attempting to import an XML file into a transient, in-memory graph using the Graph API, I discovered that if the XML has essentially same-name-sibling elements, the import will fail because the importer is not keeping track of the SNS indexes when sending paths to the import destination.

I should add that this bug is not found in the JCR importer, since that uses a different mechanism.