Surfing the Service Web Sudhir Agarwal, Siegfried Handschuh, and Steffen Staab Presenter: Yihong Ding

Web Service Service Registry Service Requestor Service provider 1. Service provider Publish Service 2. Service requestor find the service 3. Use the service through a SOAP call (use WSDL to build the SOAP request) SOAP on HTTP

WSDL Web Service Description Language  An xml vocabulary that is used to define the service interface for a web service  Service interface detail  Access protocol  Contact endpoint Service Implementation Definition Service Port Service Interface Definition Binding Message PortType Type url to accept the soap request

OntoMat-Service 1.Web service presentation 2.Deep annotation 3.Web service planning 4.Web service invocation

Web Service Presentation (Step 1) WSDL web service description  By the service provider  For machine agents or software engineers  Result: service description web pages Nicely formatted advertisement (human readable) Embedded/referred web service descriptions (machine understandable)  Usually WSDL + ontology  Manual step May be supported by tools  WSDL Document Generator (

Web Service Requests

Web Service Description

Web Service Description Web Page Laptop Vendor Service getLaptopOffers This service delivers the top offers of the laptops available in the city. We have the largest archive of the laptop offers for the city. So, the possibility that you find your desired laptop at a reasonable price is very high. Just try it and get convinced from our great offers. Processor speed Specifies the speed of the processor. Please use only the units "MHz" and "GHz". For example, "2GHz", "1.4GHz" and "1600MHz" are valid whereas "1800" or "170000KHz" are invalid. Disk space Specifies the disk space. Please use only the units "GB" and "MB". For example, "20GB", "30.5GB" are valid whereas "40" or "25000KB" are invalid. <span wsdlLocation=" elementURI=" Top Offers This is the list of the most reasonable offers available in the city that fulfill your requirements....

Deep Annotation (Step 2) Purpose  Not to annotate surface information  But to annotate background structure (the WSDL elements) Annotation  By annotators (could be end users)  Result: sets of mapping rules between web service ontologies and the client ontology Manual step  Supported by OntoMat-Service-Surfer

Service Browsing

Manual Ontology Mapping Specification Service OntologyClient Ontology Establish mapping rules in F-Logic expressions

Web Service Planning (Step 3) End user select  A set of web service operations  A set of mapping rules  Result: sets of possible web service flows Input type must match previous output type

Web Service Invocation (Step 4)

Conclusion OntoMat-Service is a framework for semantic web service  Manually specification  Automatic invocation  Local-as-View model Open questions  How to automate web service presentations?  How to automate web service mappings?  How to automatically schedule multiple services?  How to make compiled flows understandable to the users?  How to characterize the boundaries of what functionality can be aggregated and executed?