Algae with rules

(namespace '(bm http://www.w3.org/2002/01/bookmark#)
     fwrule 
    (head '
         (bm::hasTopic ?annot ?specificTopic)
         (bm::subTopicOf ?specificTopic ?generalTopic))
     body  '(
         (bm::hasTopic ?annot ?generalTopic)))
)