code: def super_terms(self):
          
  
          # If the doc already has super terms, we've already parsed something, so
          # assume we parsed the declaration, and can use re-use the old decls.
          if self.doc and self.doc.super_terms:
              return self.doc.super_terms
  
  
          return  {k.lower(): v['inheritsfrom'].lower()
                           for k, v in self._declared_terms.items() if 'inheritsfrom' in v}
docs: Return a dictionary mapping term names to their super terms