public class BookSellerAgent extends SemanticAgentBase {
  class BookSellerCapabilities extends SemanticCapabilities {...}
  class UpdateBookListBehaviour extends TickerBehaviour {...}
  public BookSellerAgent() {...}
  public void setup() {...}
}

======================================

public class BookBuyerAgent extends SemanticAgentBase {
  class BookBuyerCapabilities extends SemanticCapabilities {...}
  class AdjustBuyingPriceBehaviour extends TickerBehaviour {...}
  public BookBuyerAgent() {...}
  public void setup() {...}
}