1. A method, in a data processing system comprising a processor and a memory, for processing sources of content in a corpus of information associated with a domain, comprising: ingesting, by the data processing system, a plurality of sources of content in the corpus of information associated with the domain; determining, by the data processing system, at least one temporal category for the domain based on frequencies of occurrence of references to at least one of temporal terms or time spans specified in the plurality of sources of content in the corpus of information associated with the domain, wherein the domain is a classification of subject matter common to a plurality of portions of content from the plurality of sources of content; storing, by the data processing system, the at least one temporal category for the domain in association with the domain; and processing, by the data processing system, queries applied to the plurality of sources of content in the corpus of information associated with the domain based on the stored at least one temporal category for the domain, wherein processing queries applied to the plurality of sources of content in the corpus of information associated with the domain based on the stored at least one temporal category for the domain comprises: receiving an input question for which an answer is to be generated; analyzing the input question to determine a corresponding domain of the input question; retrieving a stored at least one temporal category for the corresponding domain of the input question; and determining a temporal category for the input question based on the retrieved at least one temporal category for the corresponding domain.