]> 2004-08-01T00:00:00-05:00 We see two main contributions in our work. First, this thesis presents an enhanced semantic web vision involving software agents, semantic web and web services. Both human and software agents can directly access the semantic-marked web pages through web interface. An agent communicates with other agents by exchanging messages encoded in a semantically rich agent communication language. Both web services and agent services are described in a semantically rich language to improve the interoperability. The personal agents and service agents work together to understand the semantic web content, automate web services and better serve humans. Second, the TAGA system attests this semantic web vision and provides a flexible environment for simulating agent-based trading in dynamic markets.]]> 6586 yXTkNk3RJGcJ 4 1011577