If you edit an element in a loop and delete it, it deletes all html matching for every loop subelement in that same element. I’ll use FezACML for Collections as the example.
1) Click rule->role->name
2) Click link beside Collection Administrator
3) Go to the bottom and click Delete
4) Click OK on the ‘Are you sure…’ dialog
5) Click rule->role->name again
You’ll see that all the XSDMF_ID fields are now blank. I would have expected only the Collection Administrator XSDMF_ID to be blank. Fortunately I was playing around with a clone when I discovered this.