tree d6b40c8da5fa33b0d9a8a998be522caad1c84bf3
parent 6b114b5e4a43e1077acf52126dfff5c18a49a676
author Edwin Kempin <ekempin@google.com> 1531320595 +0200
committer Edwin Kempin <ekempin@google.com> 1531913440 +0200

GroupReference: Mark UUID as nullable and add JavaDoc

Change-Id: I2a07f6e9bdb8f96d67c8edc1fd18dea44fcce2c1
Signed-off-by: Edwin Kempin <ekempin@google.com>