[rules-users] Adding a custom operator to drools?

[Michael Zimmermann]

Hi there,

you might see this as a follow up to a discussion named "Query by
Example" a couple of days ago, see here:
http://lists.jboss.org/pipermail/rules-users/2008-September/006520.html

Question to the devs:
Having looked through the code, adding support for a custom operator
requires
- changing the DRL.g
- regenerating the DRLLexer and DRLParser classes from this grammar
- changing the XyzEvaluator and related classes in
  org.drools.base.evaluators.

If I skip MVEL, the BRMS and other places like decision tables for now,
is this all to expand the DRL syntax? Or are any further steps required
to connect the grammar with the "java logic"?

Thanks!

Michael