(require 'databases)
(define my-rdb (create-database "foo.db" 'alist-table))
(define-tables my-rdb
  '(processor-family
    ((family    atom))
    ((also-ran  processor-family))
    ((m68000           #f)
     (m68030           m68000)
     (i386             i8086)
     (i8086            #f)
     (powerpc          #f)))

  '(platform
    ((name      symbol))
    ((processor processor-family)
     (os        symbol)
     (compiler  symbol))
    ((aix              powerpc aix     -)
     (amiga-dice-c     m68000  amiga   dice-c)
     (amiga-aztec      m68000  amiga   aztec)
     (amiga-sas/c-5.10 m68000  amiga   sas/c)
     (atari-st-gcc     m68000  atari   gcc)
     (atari-st-turbo-c m68000  atari   turbo-c)
     (borland-c-3.1    i8086   ms-dos  borland-c)
     (djgpp            i386    ms-dos  gcc)
     (linux            i386    linux   gcc)
     (microsoft-c      i8086   ms-dos  microsoft-c)
     (os/2-emx         i386    os/2    gcc)
     (turbo-c-2        i8086   ms-dos  turbo-c)
     (watcom-9.0       i386    ms-dos  watcom))))

(solidify-database my-rdb)