Breaking changes...

[Larry Barber]

As work on the VSCode Daffodil extension will soon allow it to support the new 
version of Daffodil (and, in fact, multiple versions), is there a sample schema 
and data set that can be used to demonstrate the breaking change issue for our 
testing?  Hopefully, there would also be updated schema that works with the 
newest Daffodil version.
Also wondering if the updated schema works with the older versions....
Larry