Drupal Doxygen standard for @defgroup. From https://drupal.org/coding-standards/docs#defgroup

Drupal Doxygen standard for @defgroup.php

<?php

/**  
 * @defgroup group_identifier Topic title goes here  
 * @{  
 * Summary line for the group/topic goes here.  
 *  
 * Additional documentation paragraphs go here.  
 */  
 
 // (functions, classes, etc. that belong as members of the group go here)  
 
/**  
 * @} End of "defgroup group_identifier".  
 */