OPAL: A Passe-Partout for Web Forms 06.06.2012, Uncategorized, by BigBear. This presentation showcases the OPAL tool for automatic web form understanding and filling. This demo paper was presented at WWW 2012. OPAL: a passe-partout for web forms – WWW 2012 (Demonstration) OPAL was also accepted as full paper, and here are the slides of the talk. OPAL: automated form understanding for the deep web – WWW 2012 View more presentations from Giorgio Orsi DIADEM Querying UML Class Diagrams Comments are closed.