Introduction

• The amount of Web data has increased dramatically

• Two commonly used methods to retrieve data from the Web

  • Browsing
  • Keyword Searching

• Limitations

  • inefficient
  • easy to get lost while tracing links on the Webs
  • unwanted data

• Database Retrieval Techniques

• Problem: Most Web data is unstructured or semistructured, and cannot be queried using traditional query languages

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