Data Extraction From HTML Tables Cui Tao Department of Computer Science Brigham Young University.

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Presentation transcript:

Data Extraction From HTML Tables Cui Tao Department of Computer Science Brigham Young University

Information In Tables  Nowadays, significant portion of the information on the Wed is stored in tables.

The Ontology-Based Extraction

Major Problems  In the tables, the values and their corresponding attributes are separately. But the ontology can only extract the data when they are together.  Sometimes the attributes in the table are the values in the database, the values in the table are only the identifier of the attributes.  Sometimes, the values in one cell of the table may informs several attribute values in the database.

Attribute-Value Pair Attribute: (part of the) constant/key word rule

How To Solve This Problem? Put the attribute-value pair together. Try both order.

More General…

 The attributes in the table are actually values in the database… Attribute Value

How To Solve This Problem?  Put attribute in the file depends on the Boolean value

Value Multiple Information

More Problems …