McIlraith - Knowledge Systems Laboratory DAML PI Meeting 02/14/2001 Mobilizing the Web with DAML-Enabled Web Services Sheila McIlraith Knowledge Systems.

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McIlraith - Knowledge Systems Laboratory DAML PI Meeting 02/14/2001 Mobilizing the Web with DAML-Enabled Web Services Sheila McIlraith Knowledge Systems Laboratory (KSL) Department of Computer Science Stanford University (with Son Cao Tran and Honglei Zeng)

McIlraith - Knowledge Systems Laboratory DAML PI Meeting 02/14/2001 Motivation The Web is evolving from a provider of documents and images …

McIlraith - Knowledge Systems Laboratory DAML PI Meeting 02/14/2001 Motivation … to a provider of services

McIlraith - Knowledge Systems Laboratory DAML PI Meeting 02/14/2001 Overview Problem: today’s web is designed primarily for human use. We are developing semantic markup of web services, web service users’ preferences and constraints reusable agent procedures to make services computer-interpretable, use-apparent, and agent-enabled. We are developing agent technology that exploits semantic markup to support automated web service discovery, execution, composition and interoperation.

McIlraith - Knowledge Systems Laboratory DAML PI Meeting 02/14/2001 Web Service Markup Will Enable Automation of: Web service discovery Find me an airline service that offers flights to Tuktoyuktuk Web service execution Buy me “Harry Potter and the Sorcerer’s Stone” at Web service selection, composition and interoperation Make my travel arrangements for my IJCAI conference trip Industry efforts growing (we are improving with DAML) Opportunity Area These are the drivers for web service markup.

McIlraith - Knowledge Systems Laboratory DAML PI Meeting 02/14/2001 Framework DAML-enabled web pages Web Service Ontologies Web Procedures Ontologies Agent Broker DAML-enabled personal/company constraints and prefs...

McIlraith - Knowledge Systems Laboratory DAML PI Meeting 02/14/2001 Key Feature: DAML Markup of Web Services Function, Action, Process-based web service markup: declarative well-founded semantics Ontologies enable: reuse sharing composition succinct web site markup E.g., service world-altering service purchase purchase-plane-ticket purchase-UAL-plane-ticket parameters: c-name, origin, dest, d-date, … preconditions: know(c-name), valid(credit-card), … effects: purchased(ticket), debit(credit-card)... rent rent-car... Web Service Ontologies DAML-enabled web pages

McIlraith - Knowledge Systems Laboratory DAML PI Meeting 02/14/2001 Key Feature: Generic Procedures Agents are tasked in terms of high-level, reusable “generic procedures.” “The what not necessarily the how.” Ontologies support sharing, reuse, and composition. DAML-enabled web pages Web Service Ontologies Web Procedures Ontologies Agent Broker ... E.g., Travel(cust,origin,dest,date-d,date-r,purpose) Check-purpose-related-restrictions; Book-travel(origin,dest); Book-transportation(dest); Book-hotel(dest) end;

McIlraith - Knowledge Systems Laboratory DAML PI Meeting 02/14/2001 Key Feature: Customizing Generic Procedures Generic procedures can be further constrained by DAML-defined constraints user constraints/preferences, group constraints, or instance-specific constraints. DAML-enabled web pages Web Service Ontologies Web Procedures Ontologies Agent Broker DAML-enabled personal/company constraints and prefs... E.g., Bob would like to drive if the driving distance is less than 3 hours. KSL Business air travel should be on an American carrier....

McIlraith - Knowledge Systems Laboratory DAML PI Meeting 02/14/2001 Key Feature: Deductive Instantiation Agent’s KB is automatically constructed relative to the generic procedure and constraints. KB is updated by web service responses. Deductive machinery instantiates the generic procedure wrt. constraints and world state to generate web service requests that the broker executes. KB Web Services Service Ontologies Procedures Ontologies Agent Broker Constraints & Prefs ...

McIlraith - Knowledge Systems Laboratory DAML PI Meeting 02/14/2001 Status DAML = First-order logic and some DAML+OIL Agent KB representation language = Situation Calculus Generic procedures representation language = Golog Deductive machinery = Prolog Agent Broker = Open Agent Architecture [SRI] Prototype agent/agent broker constructed. Preliminary service ontology constructed. KB Web Services Service Ontologies Procedures Ontologies Agent Broker Constraints & Prefs ...

McIlraith - Knowledge Systems Laboratory DAML PI Meeting 02/14/2001 Come to Our Demo! Teaser: Dynamic User Interface with DAML+OIL

McIlraith - Knowledge Systems Laboratory DAML PI Meeting 02/14/2001 Possible Discussion Topics What language expressive power do we need? (Let’s help drive language development.) What collective tools do we need? (Let’s coordinate and share the effort.) How do we interact with each other? How do we interact/leverage with industry efforts?...