I\'m trying to extract triplet subject, predicate, and object from sentence. I need more references on how to do this.
you can use Stanford parser API or Open NLP to make part of speech tagging and some other NLP operations
and for the triplet extraction you can implement one of the techniques in the papers available on the internet , i know a good one to implement : http://ailab.ijs.si/delia_rusu/Papers/is_2007.pdf