Like (Haghighi and Vanderwende, 2009), (Daumé and Marcu, 2006), and (Barzilay and Lee, 2004), we model words as being generated from latent distributions.
instead of background, content, and document-specific distributions, we model all words in a document set as being there for one of only two purposes: a semantic (content) purpose, or a syntactic (functional) purpose.