  distribution
   layout_version 1.0

   product
    tag bc1
    fileset
       tag etc
      directory  /etc /usr/tmp/aa
       file passwd 
   
   product
    tag bc2
    fileset
      tag etc
      control_file
       tag postinstall
        source bc-1.04-2/postinstall
       file
          path aa1
       file
          path aa2


   product
    tag bc3
    control_file
     tag postinstall
    control_file
     tag preinstall
    fileset
     	tag etc
        directory  /etc /usr/tmp/aa
       control_file
        tag postinstall
        interpreter /bin/sh
        source bc-1.04-2/postinstall
       control_file
        tag postinstall
        interpreter /bin/sh
        source bc-1.04-2/postinstall
       file
           path aa
           source bb
       file
           path aa1
           source bb1



