cs2103aug2014-w10-1c/main — pull request #136 by digawp (2014-10-06 08:23:13+00:00)
Title: Proposed Datastore API

#90 #119
This is the DataStore API to be exposed to Query Engine.
DataStore is a singleton that pushes Operations to the deque that will later be committed by Transaction.
Transaction ensures that there is only one instance of DataStore that is accessing/modifying the xml tree at any point of time.
Operation classes coming in the next PR