The Interaction of Knowledge Sources in Word Sense Disambiguation

course(2) fulfils this criterion, course is modif ied by hilly which expects a noun of type noumovable s o l i d . However , course(2) is m a r k e d a b s t r a c t , which does not comply with this restriction. Therefore, a ssuming that run is being used in its second sense leads to a si tuation in which there is no set of senses which comply wi th all the restrictions placed on them; therefore run(l) is not the correct sense of run and the partial tagger marks this sense as wrong. This si tuation is represented b y the tree at the bo t tom left of Figure 4. The sense course(2) is not rejected at this point since it m a y be found to be acceptable in the configurat ion of senses of another sense of run. The algor i thm n o w assumes that run(2) is the correct sense. This implies that course(I) is the correct sense as it complies wi th the i n a n i m a t e restriction that that verb sense places on the direct object. As well as comply ing wi th the restriction imposed by run(2), course(I) also complies wi th the one imposed by hilly(i), since nonmovable s o l i d is s u b s u m e d by inan imate . Therefore, a s suming that the senses run(2) and