1. A method comprising: retrieving, from a memory, a global structure and a plurality of candidate answers therein; computing a first probability of a candidate answer based on a local structure of the candidate answer within the global structure; computing a second probability of the candidate answer based on content of the candidate answer given content of a query; computing a third probability of the candidate answer based on context of the candidate answer given the content of the query; and providing a combined probability of the candidate answer as a function of the first probability, second probability, and third probability.