Integrating Deep Web Data Sources

As an important step towards this goal, this dissertation studies the problem of integrating query interfaces of Deep Web sources. Interface integration typically involves three very challenging tasks: (1) schema extraction , which infers the schema of each source query interface from its (HTML) representation; (2) schema matching, which accurately identifies semantic mappings among the attributes from different interfaces; and (3) schema merging, which properly merges the source interfaces into a well-formed global interface based on the identified attribute mappings.