Physical versus Logical Structure

• In some cases, data can be modeled in relational or object-oriented models, but extracting the tuples is hard

  • extracting data from HTML:
    • [Ashish and Knoblock, 97], [Hammer et al., 97], [Kushmerick and Weld, 97].

• Semi-structured data: when the data cannot be modeled naturally or usefully using a standard data model.

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