Thanks, Clay. I was distracted by the fact that our linking relies on ID
attributes on the title parent, not on title. If I add any attribute, type
ID, to title and populate it, it works as you say. So now I'm trying to
hack away and cheat the fact that our IDs are on title parents to see if I
can get away without requiring an additional (or relocated) ID attribute.
But ... worst case, I can write the parent ID with "title" appended or some
similar strategy to the title element on save.
Thanks again.