In this paper we propose a novel technique for summarizing a text based on the linguistics properties of text elements and semantic chains among them. In most summarization approaches, the major consideration is the statistical properties of text elements such as term frequency. Here we use centering theory which helps us to recognize semantic chains in a text, for proposing a new automatic single document summarization approach. For processing a text by centering theory and extracting a coherent summery, a processing pipeline should be constructed. This pipeline consists of several components such as co-reference resolution, semantic role labeling and POS [Part of speech] tagging.

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