[rules-users] Dynamic facts

[Marc Heinz]

> On 19 July 2011 13:42, Marc Heinz <marc.heinz at no-log.org> wrote:
>> So, despite I have only updated one attribute of the fact (the age of a
>> Person), all rules have been fired again, even if they had nothing to do
>> with the said attribute, which could possibly produce a huge overhead.
>>
>> I maybe misunderstood some basic concept here... But is there a way to
>> prevent that?
>>
>
> Reevaluation of all patterns referring to the type of a fact/object that
> has been changed is a fundamental principle of production rule systems.

Ok, if I have well understood, my first assumption that I was trying to
explain still holds: we should minimize dependencies between rules and
fields from a single fact in order to have a finer granularity for
updates... Which could effectively requires to dispatch a POJO internal
structure into several other facts.

Actually we were considering doing exactly the opposite in a first time:
using enclosing classes extensively in order to make easier to provide
some kind of structural constraint on the content of the knowledge base
(such as: each values of this set should appears at most once in the
knowledge base at any give time), but this is probably better done using
the working memory in "equality mode" with custom equals methods.

Thank you again for these precision :)

Cheers,
Marc