code: def set_license(self, license_):
          
          self._my_map['license'] = self._get_display_text(license_, self.get_license_metadata())
docs: Sets the license.
  
          arg:    license (string): the new license
          raise:  InvalidArgument - ``license`` is invalid
          raise:  NoAccess - ``Metadata.isReadOnly()`` is ``true``
          raise:  NullArgument - ``license`` is ``null``
          *compliance: mandatory -- This method must be implemented.*