code: def delete_asset(self, asset_id=None):
          
          # Implemented from awsosid template for -
          # osid.resource.ResourceAdminSession.delete_resource_template
          # clean up AWS
          asset = self._asset_lookup_session.get_asset(asset_id)
          for ac in asset.asset_contents:
              self.delete_asset_content(ac.ident)
          self._provider_session.delete_asset(asset_id)
docs: Deletes an ``Asset``.
  
          arg:    asset_id (osid.id.Id): the ``Id`` of the ``Asset`` to
                  remove
          raise:  NotFound - ``asset_id`` not found
          raise:  NullArgument - ``asset_id`` is ``null``
          raise:  OperationFailed - unable to complete request
          raise:  PermissionDenied - authorization failure
          *compliance: mandatory -- This method must be implemented.*