XABDAT

   On Alpha systems for Files-11 B (ODS-2) media, the date and
   time XAB (XABDAT) block provides extended control of the date
   and time of the file's creation, revision (update), backup, and
   expiration.

   The following table lists the symbolic offset, the size in bytes,
   FDL equivalent, and a brief description of each field.

                       FDL
   Offset      Size    Equivalent     Description

   XAB$Q_BDT   8       DATE BACKUP    Backup date and time
   XAB$B_BLN   1       None           Block length
   XAB$Q_CDT   8       DATE           Creation date and time
                       CREATION
   XAB$B_COD   1       None           Type code
   XAB$Q_EDT   8       DATE           Expiration date and time
                       EXPIRATION
   XAB$L_NXT   4       None           Next XAB address
   XAB$Q_RDT   8       DATE           Revision date and time
                       REVISION
   XAB$W_RVN   2       FILE           Revision number
                       REVISION
   XAB$Q_ACC   8       None           Last time file accessed
   XAB$Q_ATT   8       None           Last time file attribute
                                      modified
   XAB$Q_MOD   8       None           Last time file data modified