[rules-users] Rewriting rules

[jwillans2]

Hi Wolfgang,

Thanks.  'Object' was intended as a placeholder for any type and 'slot' for
any attribute instance, sorry for the confusion here.  I appreciate your
suggestion below, however since there would be multiple rules which need
this type of injection each requiring a unique (and only known only at
runtime) id.  By having a global id provider (aka ItemPara) it would be
unable to provide the appropriate id - unless the rule identified itself
when making the id request (ItemParam( field == "id", $value: value )).  It
seems that templates might be the way forward, although the rules will need
recompiling each runtime.

> rule "example"
>  when
>    $op : ObjectProvider()
>    Object(slot = "value") from op.eval()

Because getting the value returned by op.eval() is extremely expensive and
should only be done if this component of the rule is evaluated (assuming
that the rule has a more complex pattern implicating other types).

Thanks,

James

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