More contributors are always welcome. IETF working groups are open to any technically competent individual who wishes to contribute. Individuals represent their own views on the best way to solve the problem, rather than the agenda of their employer. There is also an effort by the ISO's T4 committee to develop an Intrusion Detection Framework. The status of that effort is presently unknown, and attempts by the FAQ item author to reach prominent figures in that effort were unsuccessful.
CIDF development is presently dormant.
CIDF used a Lisp like format to exchange information about intrusion related events, and defined a large set of primitives for use in those messages.