Introduction to the Search Engine Robot

A search engine robot is an agent that identifies and reports on resources in its domains; it does so by using two kinds of filters:

• Enumerator Filter The enumerator filter locates resources by using network protocols. It tests each resource, and, if it meets the selection criteria, it is enumerated. For example, the enumerator filter can extract hypertext links from an HTML file and use the links to find additional resources.

• Generator Filter.- The generator filter tests each resource to determine if a resource description (RD) should be created. If the resource passes the test, the generator creates an RD which is stored in the search engine database.