I saw on a related question some mentions of a formal grammar definition for English. It is mentioning there a definition called English Resource Grammar. Perhaps anyone here would know about loosely equivalent sources that like this one are fit for direct use by software.
Otherwise, questions relating to that single resource called English Resource Grammar : The download archive of it has a readme that is only a change log / release notes. How should the content of this huge archive be interpreted? what ontology does it use for its production rules? in what ways does one use it with the related software LKB and/or PET?