Requirement: Enhanced Find operator

Requirement Type: Language feature

Requirement Name: Enhanced Find operator. 

Requirement Description: Ability to Find/catch Event 
combinations.

Requirement Rationale: the current Find operator is only 
selecting one event, or a set of events based on one selection condition only. 
This operator cannot catch a combination of correlated events, where each one of 
which requires a different selection condition (e.g. select a combination of 
correlated messages: a PurchaseOrder, followed by a POAcceptance or a 
PORejection, followed by a POReceipt). To catch such a combination requires 
today to do the coding of such a workflow inside the Monitor script itself, 
while these details could be lowered inside the Find operator itself, when the 
combination is straightforward enough. An enhanced Find operator would also 
allow for optimized translation and query execution over a database: becomes the 
work of the Event Manager as opposed to the Script Language processor.