1. Automatic Extraction of Information Behind Web Forms Based on Application Ontologies Automatic Extraction of Information Behind Web Forms Based on Application Ontologies by Sai Ho Yau Brigham Young University

2. NextPreviousIntroduction There are enormous amounts of information available from the Web, but it is difficult to extract the data automatically due to several reasons: Dynamically generated Web pages Form interfaces Relevant information can be obtained only after a Web form is filled out and submitted

3. NextPrevious Problems Dealing with Forms No general Web form design Required text fields One form may lead to another Resulting information embedded within forms Returned error messages versus valid data Elimination of possible duplicate data

4. NextPrevious The Framework

5. NextPreviousTools Language and Internet browser used: JavaScript, Java, PHP3., MySQL; Microsoft Internet Explorer Platform: Solaris Intel (Unix), with Sun Java 1.1.6.

6. NextPrevious Method: Construct the Query String

7. NextPrevious The Goal Deal with as many Web forms as possible. Retrieve all relevant information. Automate the extraction process.

8. NextPrevious Returned Web Page

9. NextPrevious Suggested Solution

10. NextPreviousConclusions Eliminate duplicate data. We can automatically: Fill in Web forms. Extract information behind forms. Screen out error messages and inapplicable Web pages.

11. NextPrevious Thank You