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NUS at TAC 2008: Augumenting Timestamped Graphs with Event Information and Selectively Expanding Opinion Contexts

Our team explored several new approaches in the update and opinion summarization tasks in the Text Analysis Conference (TAC) 2008. For the update task, we refine our previous timestamped graph approach by incorporating information about temporal ordering of events in the articles, by using the publicly available Tarsqi toolkit. For the pilot opinion task, we utilize the provided opinion snippets as clues to locate their source sentences. Our system expands the context around the snippets’ source sentences for two purposes. First, tomore accurately identify the polarity of the contained opinion; second, to selectively include the context for added coherence in our answers.