Create Parent-Child video via Bulk XML Upload/Update

Greetings all! I have some media entries (video and content) that I would like to make into parent-child entries, preferably using the bulk XML upload/update process.

From the documents provided, and doing this in the TestMe console successfully*, it seems pretty straightforward, but the “parentEntryId” is not listed in the XML Schema, and when I attempt to add that to my xml, it is not recognized. Is this possible through XML?

*In TestMe Console, using ‘baseEntry.update’ on the “content child entry”, and updating it’s ‘parententryid’ to the “video parent entry”

Thanks in advance for any help!