Service-Oriented Computing: Semantics, Processes, Agents August 2004 Chapter 19: Semantic Service Selection Service-Oriented Computing: Semantics, Processes, Agents – Munindar P. Singh and Michael N. Huhns, Wiley, 2005 © Singh & Huhns

Highlights of this Chapter Service-Oriented Computing: Semantics, Processes, Agents August 2004 Highlights of this Chapter Semantic Matchmaking An Advertising and Matchmaking Language Selecting Services SoCom Matchmaking Chapter 19 Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns © Singh & Huhns

Discovery versus Selection The purpose behind discovering a service is to select a good one We don’t need to find all services Just the one that’s best for us! By focusing on selection, we can Improve the payoff Reduce overhead from trying irrelevant or less relevant services Chapter 19 Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

Where Does Selection Apply? Service users looking for providers Service providers looking for users Brokers looking for both users and providers Markets to be populated with participants Spheres of Commitment or organizations to be instantiated The situation is fundamentally symmetric Chapter 19 Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

Semantic Matchmaking Match using an ontology Domain of a service Preconditions and effects of methods Use ontologies to reformulate queries and generate query plans by Generalizing or specialize concepts Partitioning concepts Decomposing properties Chapter 19 Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

Matchmaking Language Describing services and formulating service requests involves Provenance and ownership Cost Service agreements (e.g., refundable?) Resource requirements Availability: geographic, temporal, … Payment mechanisms Empirical, evaluative aspects (Chapter 20) Chapter 19 Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

Semantic Team Matchmaking Service-Oriented Computing: Semantics, Processes, Agents August 2004 Semantic Team Matchmaking Represent commitments and capabilities Define abstract spheres of commitment (SoComs) in terms of roles, e.g., buy-sell: Capabilities: can issue quote and ship, can pay Commitments: will honor price quote; will pay To adopt a role, an agent must Possess the capabilities Acquire the commitments Chapter 19 Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns © Singh & Huhns

Consumer and Provider Agents SoComs provide the context for concepts represented & communicated Chapter 19 Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns

Service-Oriented Computing: Semantics, Processes, Agents August 2004 Chapter 19 Summary Service selection is key in SOC Involves suitably rich representations of Services Services requested or desired More than two-party, client-server: Formation of SoComs to solve complex business problems Chapter 19 Service-Oriented Computing: Semantics, Processes, Agents - Munindar Singh and Michael Huhns © Singh & Huhns