docs: function(cid) {
  
      // Get list of generic containers.
      return list()
      // Filter by container id and container name.
      .filter(function(container) {
        return container.id === cid || container.name === cid;
      })
      // Return head on results.
      .then(function(results) {
        assert(results.length < 2);
        return _.head(results);
      });
  
    }