docs: def set_group(self, group):
          """Sets the resource as a group.
  
          arg:    group (boolean): ``true`` if this resource is a group,
                  ``false`` otherwise
          raise:  InvalidArgument - ``group`` is invalid
          raise:  NoAccess - ``Metadata.isReadOnly()`` is ``true``
          *compliance: mandatory -- This method must be implemented.*
  
          """
          # Implemented from template for osid.resource.ResourceForm.set_group_template
          if self.get_group_metadata().is_read_only():
              raise errors.NoAccess()
          if not self._is_valid_boolean(group):
              raise errors.InvalidArgument()
          self._my_map['group'] = group