Yury,

    Correlation can happen in many ways, but I would say your general approach is correct. Answering your questions:

1. Both collect and accumulate work (as it is today) on single patterns. This means whenever you are using collect, you could be using accumulate. Just have in mind that accumulate is more powerful and flexible that collect, but it is also heavier. So, if collect does what you need, go with collect, otherwise fall back to accumulate.

3. Collect is incremental (on 4.0 GA) for all working memory operations: insert/update/retract. Accumulate is always incremental for insert, but for modify and retract it is incremental only if you provide the "reverse" action in case you are using adhoc operations. If you are using accumulate functions, modify and retract are incremental if the function supports reverse calculation.

    []s
    Edson

2007/8/1, Yuri de Wit <ydewit@gmail.com>:
I am finally having some time to use collects. What I basically need
to do is to collect items from a list using a specific criteria, then
collect items from a diff list using another criteria, and finally
compare the groups collected using a 3rd criteria

Here is what I am thinking:

i : Item(type==A)
ig : ItemGroup(size>1)
         collect Item(a==i.a, b==i.b, ... n==i.n)

i2: Item(type==B)
ig2 : ItemGroup( size>1,
                         ga== ig.ga, gb==i.gb, .... )
         collect Item(a==i.a, b==i.b, ... n==i.n)

1) It is quite nice that any implementation of java.util.Collection
can be the resut of collect. ItemGroup here not only keeps hold of all
Items returned but has some aggregate properties (afaik, I cannot use
the aggregate functions with accumulate since I have multiple column
aggregation).

2) Am I on the right track? Or is there a better way?

3) Is the collect recomputed from scratch or incrementally every time
a new fact is asserted or updated?

thanks
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  Edson Tirelli
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