Selection Rules Implement Heuristics
- Selection rules decide how parsing will proceed.
- For example, Kimball's Closure principal is implemented by
selecting a rule that absorbs the most recent phrase.
- General heuristics, like Closure, are implmented by
selection rules with low preferences.
- They can be overriden by selection rules with higher preferences,
that use more semantic information or more input.
- Since selection rules are UBG equations, they can use broad
categories like VP, or very specific values such as the word.
- General and specific selection rules are separated by
preference values.
- General selection rules do most of the work, but specific selection
rules can catch the exceptions.
