[rules-users] Checking if elements in one collection exist in another collection

[Nick Heudecker]

I have two objects with nested collections in my working memory.  I need to
determine if elements from one collection exist in the other collection.
Here's an idea of what my objects look like:

Class Foo:
List<Token> tokens

Class Bar:
List<Token> tokens

I'm putting instances of Foo and Bar into the working memory.

A few days ago I got this generic suggestion but I'm not sure what it's
actually doing:

A( $colA : collection )
B( $colB : collection )
exists( Object( this memberOf $collectionB ) from $colA )

Can someone expand on that and explain what's happening?  Any help is
appreciated.

Regards,
Nick
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