code: def get_asset_lookup_session_for_repository(self, repository_id, proxy, *args, **kwargs):
          
          if not repository_id:
              raise NullArgument()
          if not self.supports_asset_lookup():
              raise Unimplemented()
          try:
              from . import sessions
          except ImportError:
              raise OperationFailed('import error')
          proxy = self._convert_proxy(proxy)
          try:
              session = sessions.AssetLookupSession(repository_id, proxy, runtime=self._runtime, **kwargs)
          except AttributeError:
              raise OperationFailed('attribute error')
          return session
docs: Gets the OsidSession associated with the asset lookup service
          for the given repository.
  
          arg:    repository_id (osid.id.Id): the Id of the repository
          arg     proxy (osid.proxy.Proxy): a proxy
          return: (osid.repository.AssetLookupSession) - the new
                  AssetLookupSession
          raise:  NotFound - repository_id not found
          raise:  NullArgument - repository_id is null
          raise:  OperationFailed - unable to complete request
          raise:  Unimplemented - supports_asset_lookup() or
                  supports_visible_federation() is false
          compliance: optional - This method must be implemented if
                      supports_asset_lookup() and
                      supports_visible_federation() are true.