code: def add_copy_spec_scl(self, scl, copyspecs):
          
          if isinstance(copyspecs, six.string_types):
              copyspecs = [copyspecs]
          scl_copyspecs = []
          for copyspec in copyspecs:
              scl_copyspecs.append(self.convert_copyspec_scl(scl, copyspec))
          self.add_copy_spec(scl_copyspecs)
docs: Same as add_copy_spec, except that it prepends path to SCL root
          to "copyspecs".