*COMDECK MDDCWDCLS
  
# THE FOLLOWING ITEMS DESCRIBE THE DIRECTORY CONTROL WORDS             #
  
        ITEM MDSDSIZE U(0,00,18);  # SCH DIRECTORY SIZE IN WORDS       #
                                   # BITS 18-29 ARE UNUSED             #
        ITEM MDWALUWD U(0,30,30);  # WA OF LAST USED WORD IN MD        #
        ITEM MDLSTSID U(1,00,12);  # LAST USED SCHEMA ID               #
        ITEM MDSZPFN  U(1,12,18);  # PFN TABLE SIZE IN WORDS           #
        ITEM MDWAPFN  U(1,30,30);  # WA OF PERM FILE NAME TABLE        #
        ITEM MDCWVERS U(2,00,12);  # MD INTERNAL VERSION NUMBER        #
                                   # BITS 12-17 ARE UNUSED             #
        ITEM MDSDNO   U(2,18,12);  # NUMBER OF SCHEMA DIRECTORIES      #
        ITEM MDSDWA   U(2,30,30);  # WA OF SCHEMA DIRECTORY            #
        ITEM MDCWIDNT C(3,00,02);  # MD FILE IDENTIFIER STRING         #
        ITEM MDCWPROD C(3,12,03);  # MD EXTERNAL VERSION NUMBER        #
        ITEM MDCWDATE C(3,30,05);  # MDU CREATION DATE                 #
        ITEM MDCRTIME C(4,00,05);  # TIME OF MD FILE CREATION          #
        ITEM MDCRDATE C(4,30,05);  # DATE OF MD FILE CREATION          #
        ITEM MDCHTIME C(5,00,05);  # TIME OF MD FILE LAST CHANGE       #
        ITEM MDCHDATE C(5,30,05);  # DATE OF MD FILE LAST CHANGE       #
                                   # WORDS 6-DFMDNUMCWM1 ARE           #
                                   # RESERVED FOR LATER USE            #
  
