This is awesome! While I'm nowhere near being able to leverage this right now, I am currently going through the painful process of "databasing" raw documents into SQL, and I can tell you that perhaps the hardest part is getting the schema correct; as you put it "natural language can often be ambiguous". Even worse, is just the squishiness of things never originally intended to be specified for software.

Communication always has been, and continues to be, the hardest part of software development.