[bjourne]

This is an area that has been researched for decades and there is a wealth of prior art. If you want to pursue this idea you should narrow it down a bit. For example, creating a usable natural language interface for databases for GIS data for land surveying would in itself be a massive project. It should also be said that "plain English" is far from "plain" even for native speakers. It's not just about parsing it is also about making it usable.