title: Swagger 2.0 inheritance possible?
body: <p>I am trying to reuse existing (say, base.yml) YAML definitions by inheriting and overriding base.yml's function 'A'. </p>
  
  <p>Note that this base.yml is shared by a different team and I am not supposed to modify it.</p>
  
  <p>Hence, I want to write a new YAML definition file (say, derived.yml) which inherits from base.yml, but redefines just 'A' as I needed.</p>
  
  <p>Is there a way to achieve this? I read about Swagger 3.0, which supports constructs like OneOf, AllOf etc (which I am still exploring) but primarily I am looking at Swagger 2.0, as much as possible. </p>