| In section 6, you mention readability. If you read XML documents
| using Notepad or vi, container elements do not help readability.
| However, if you use a folding XML editor/viewer, even Internet
| Explorer, containers are great for folding up a repeated group of
| elements that you do not want to look at. You do not need
| hundreds, nor even thousands, of items for this to be true.
This is a *huge* UI advantage. Giving every user the ability to
open a big UBL instance in a ubiquitous web browser and
collapse/expand to find her way around is enough all by itself to
make a case for containers.
Jon
