[rules-users] Structuring rules in Drools

[laune]

"To figure out a hierarchical structure among rules" isn't a very clear
definition...

Rules (like many other logical entities in some programming environment) are
written in compilation units - DRL file, which imposes one "hierarchical
structure". Then, they are subordinate to "packages" (much like Java
classes), which creates another "hierarchical structure". A rule attribute
such as "agenda-group" establishes another structure, completely independent
from the aforementioned ones, which is effective at runtime, when rules of
one group are firing exclusively.

Another notion of "hierarchical structure" is introduced by the rule feature
"extends", where you can continue the condition of one rule in several other
rules.

As for interaction: there are many ways you can create "interaction", but
typically it will have to be based on facts inserted by one rule and
recognized by other rules. As people might interact without direct
communication, just by sticking chits on a notice board...



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