Existential Change Verbs?

If you find a sentence like "Our reservations were cancelled by the hotel computing system" you need to know that, whether you name them or not, whether you're using bag-of-words or not, someone's reservations do not exist anymore in that hotel.

Patricia Amaral, Cleo Condoravdi, Annie Zaenen and I worked a little on the problem of classifying verbs that exhibit this "existential change" effect. We submitted a paper to a context workshop in 2008, it was accepted, but no one had time to travel for that conference. Now we submitted it again to ONTOBRAS-MOST 2012 in Recife.