code: public ClassDoc[] interfaces() {
          ListBuffer<ClassDocImpl> ret = new ListBuffer<ClassDocImpl>();
          for (ClassDocImpl c : getClasses(true)) {
              if (c.isInterface()) {
                  ret.append(c);
              }
          }
          return ret.toArray(new ClassDocImpl[ret.length()]);
      }
docs: Get included interfaces in this package, omitting annotation types.
  
  @return included interfaces in this package.