As we will soon see, such a framework can be regarded as a generalization of several existing summarization methods.
we list below some possible future extensions: 1) integrating different selection strategies, e.g., the listwise strategy that defines the loss function on all the sentences associated with a document to be summarized, into this framework, 2) exploring different modeling approaches for this framework, 3) investigating discriminative training criteria for training the component models in this framework, and 4) extending and applying the proposed framework to multidocument summarization tasks.