Quick now, what IS the difference between UML and DSL?

The DSL, MDA, UML thing again... | Lambda the Ultimate

Can you have one metamodel across differnet domains that, nonetheless can be tailored? If you do, can the transformation be small variations on one another ? Can we ever expect them to be totally automated? (no) What is a domain anyway : industry, level of abstraction?

This seems to be one of those arguments where the terms involved remain unresolved and ambiguous (at least to me)