Phrase Structure Trees Bear More Fruit than You Would Have Thought

We will also discuss other amendments to context-free grammars which increase the descriptive power but not the generative power. In particular, we will discuss the notion of categories with holes as recently introduced b y Gazdam [3]. There is an interesting history behind this notion. Sage~'s parser explieitly exploits such a convention and, in fact, uses it to do some coordinate st-ructnK-a computation. We suspect that some other parsers have this feature also, perhaps ~plicitly. We will discuss this matter, which obviously is of great interes~ to computational linguists.