Re: [xml-dev] How to create an XML language that is the intersection of two XML languages?

On 12/30/2013 05:00 PM, Costello, Roger L. wrote:

> Now, person #6 wants to reuse them to create an XML language that is the intersection of the two languages. 
> 
> How would person #6 create this intersection language (without any change to the As-and-Bs language or the Bs-and-Cs language)?

What is the requirement?  Are instances of #6 expected to be validatable
as  #4 and/or #5?  Are instances of #4 or #5 expected to be validatable
as #6?