Much of the information on the Web is stored in specialized searchable databases and can only be accessed by interacting with a form or a series of forms. As a result, enabling automated agents and Web crawlers to interact with form-based interfaces designed primarily for humans is of great value. This thesis describes a system that can fill out Web forms automatically according to a given user query against a global schema for an application domain and, to the extent possible, extract just the relevant data behind these Web forms. Experimental results on two application domains show that the approach is reasonable for HTML forms.

This work contains a brief overview of technologies for representation and obtaining data on WWW and describes selected web data extraction tools. The work designs a new tool for obtaining pages generated by filling in web forms, which allows its user to define data on such web pages and which can extract those data and offer it in a XML format suitable for future machine processing.