X-Query intersect operator

Dear All,
Have anybody used intersect operator before? I have used it but it did not returned any object although there should be.

//price[//@year=2000] intersect //price[//@year=1999]

When I executed those two queries separately I got answer sets which have common elements.

Can anybody help me?


I’ve tried the same with the cruise schema with Tamino 2.3 and it returns nothing either. Looks like a problem worth raising.

cruise//price[//@yachtid=‘153’] intersect //price[//@file=‘route.gif’]

Separately these return document sets and I can see common ino ids in them, but put together as above nothing is returned.