Last Call issue: How does the Operation Name Mapping Requirement (Part 1, section 2.2.1.1) relate to interface inheritance?

I'd like to see further clarification of the relationship between the
Operation Name Mapping Requirement (Part 1, section 2.2.1.1) and
interface inheritance (Part 1, section 2.2.1). Specifically, I have
three questions:
 
Can a derived interface meet the Operation Name Mapping Requirement
using a mechanism different from the mechanism(s) used by its base
interface(s)?
 
If not, is it a requirement that a derived interface only extend base
interfaces that use the same mechanism to meet the Operation Name
Mapping Requirement?
 
If so, is it then the case that a single derived interface can not
extend multiple base interfaces that use different mechanisms to meet
the Operation Name Mapping Requirement?
 
Thanks,
Tim-