[rules-users] Noob question: graph searching, query, root node for a given node

I'm after a quick bit of help on how to do something that I think should be easy but I can't work out how. I have a Java-side class that essentially is something like declare Datum description: String broader: List <Datum> narrower: List <Datum> end These are arranged in a graph. Root nodes have no items in their broader list. I want a query that takes a datum and yields the root nodes for that datum. I think this should look something like query rootDatumsFor( Datum datum, Datum result ) not Datum() from $datum.broader or rootDatumsFor( $datum.broader, $result ) end but I then get confused. When there are no broader items, I am unclear how to assign $datum to $result. And I'm not convinced I'm doing the recursion correctly either. If an experienced Drools author could spend a minute and show me how to do this sensibly, I would be very grateful. -- View this message in context: http://drools.46999.n3.nabble.com/Noob-question-graph-searching-query-roo... Sent from the Drools: User forum mailing list archive at Nabble.com.