Interesting! When I worked at IBM, we evaluated Duckling (the Haskell version) for use in the Watson Assistant product but decided to write our own numerical qu

Interesting! When I worked at IBM, we evaluated Duckling (the Haskell version) for use in the Watson Assistant product but decided to write our own numerical quantity parser/interpreter. We used ANTLR and created context-free grammars as we found that we could improve both precision and recall substantially. Sadly not open source though.