The syntax of IXLALTER is written as follows:

main diagram

>>-IXLALTER--b----STRNAME=strname------------------------------->

>----,REQUEST=-+-START--| parameters-1 |-+---------------------->
               '-STOP--------------------'     

>--+------------------+--+------------------+------------------->
   '-,RETCODE=retcode-'  '-,RSNCODE=rsncode-'   

   .-,PLISTVER=IMPLIED_VERSION-.   
>--+---------------------------+-------------------------------->
   +-,PLISTVER=MAX-------------+   
   '-,PLISTVER=plistver--------'   

   .-,MF=S--------------------------.   
>--+--------------------------------+--------------------------><
   |                .-,0D-----.     |   
   +-,MF=(L-,mfctrl-+---------+-)---+   
   |                '-,mfattr-'     |   
   |                .-,COMPLETE-.   |   
   '-,MF=(E-,mfctrl-+-----------+-)-'   
                    '-,COMPLETE-'       

parameters-1

   .--------------------------------------------------------------.   
   V                          (1)                                 |   
>>---+-,SIZE-,STRSIZE=strsize-----------------------------------+-+-><
     +-,RATIO-,ENTRYRATIO=entryratio-,ELEMENTRATIO=elementratio-+     
     '-,EMCSTG-,EMCSTGPCT=emcstgpct-----------------------------'     

1. Choose each keyword (SIZE/RATIO/EMCSTG) no more than once.