The model is appealing in that it can potentially overcome the limitation of mention-pair model in which dependency among mentions other than the two in question is ignored.
models in (McCallum and Wellner, 2003) compute directly the probability of an entity configuration conditioned on mentions, and it is not clear how the models can be factored to do the incremental search, as it is impractical to enumerate all possible entities even for documents with a moderate number of mentions.