define_rules( <<'EOF' );
# careful - all whitespace is significant in this format.
# use whole-line comments if you need spacers.
UNIGRAPHICS_NX
    1: key = NX1
    2: key = NX2
       key = other

\bNX\b
    3: key = NX3
    4: key = NX4

SOLID_EDGE
    18: key = SE18
    16: key = SE16
    17: key = SE17
        key = other

WEBTOOLS
    key = # use the default key, which is $family

TC_ENGR-IMAN
    key = TC_ENG

TC_COMMUNITY
    key = TC_COM

  # default. Unfortunately, this "comment" isn't optional. :-(
    key = other
EOF