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Nowadays databases have become web accessible through HTML form-based search interfaces The data units returned are encoded into the result pages dynamically for human browsing. For the encoded data units to be machine processable , which is essential for many applications such as deep web data collection and Internet comparison shopping, they need to be extracted out and assigned meaningful labels. Deep Web contents are accessed by queries submitted to Web databases and the returned datadoi:10.21275/v5i2.nov161214 fatcat:byuitsutfndi7enfo27tweiy4e