It is well known today that pages on the Web contain a large number of content-rich relational tables. Such tables have been systematically extracted in a number of efforts to empower important applications such as table search and schema discovery. However, a significant fraction of relational tables are not embedded in the standard HTML table tags, and are thus difficult to extract. In particular, a large number of relational tables are known to be in a ``list'' form, which contains a list of clearly separated rows that are not separated into columns.
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Chu et al. (2015) studied this question.
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