1 UIM with DAML-S Service Description Team Members: Jean-Yves Ouellet Kevin Lam Yun Xu

2 Outline RDF DAML+OIL DAML-S UIM with DAML-S Service Description References

3 RDF Resource Description Framework (W3C) –An infrastracture that allows to model semi-structured metadata and enables knowledge-management allocations. –Uses XML as an interchange syntax and heavily relies on XML namespaces. –Uses a single directed graph as a model to describe resources. –Aims to enable the entire Web to become a semantic Web. –RDF Schema (RDFS) provides basic structures such as classes and properties.

4 RDF Example

5 DAML+OIL DARPA Agent Markup Language + Ontology Inference Layer –A simple language for expressing more sophisticated classifications and properties of resources than RDFS –Provides richer means for expressing constraints in schemas: More facilities for properties data typing, multiple ranges and unique properties inverse properties, transitivity, property restriction Broadening the concept of class disjoint, non-exclusive combinations

6 DAML+OIL DAML+OIL file structure: –RDF envelope element –DAML+OIL header –Import declarations for using other RDF models –New class definitions –Class instances

7 DAML+OIL Example

8 DAML-S A new set of classes and properties that are defined using DAML+OIL –Enables the creation of the ontologies for the description of specific Web sites in any domain –Establishes a framework within which the descriptions are made and shared –Supports access to Web resource by content: Automatic Web service discovery Automatic Web service invocation Automatic Web service composition and interoperation Automatic Web service execution monitoring

9 DAML-S ServiceProfile A high-level description of service with name, inputs and outputs. Service providers use discovery/location registry to advertise service. Service requesters use the profile to specify what service they need. ServiceModel Description of the processes or the algorithm used to implement a service. ServiceGrounding Specification of the details of how an agent can access a service : communication protocols, port numbers and data types.

10 <rdf:RDF xmlns:rdf= " xmlns:rdfs= " xmlns:daml= " xmlns:profile= " xmlns:xsd= " 1.0 Description of the services supported by agent bond007. bond007 printer Printer service supported by agent bond007 DAML-S Service Advertisement Example

11 DAML-S Service Advertisement Example (contd) bond007_printer_service A message can be sent directly to a printer printer message <profile:restrictedTo rdf:resource=" /> bond007

12 DAML-S Service Request Example <rdf:RDF xmlns:rdf= " xmlns:rdfs= " xmlns:daml= " xmlns:profile= " xmlns:xsd= " 1.0 print bond

13 UIM with Service Advertisement and Discovery - Based on a RMI version of UIM - DAML-S ServiceProfile class only

14 New UIM Graphical User Interface

15 Modified Register Command New Register Panel –Parameters: AgentId, Password, Service Advertisement –Two methods for advertising a DAML-S file: 1) Enter the filename of an existing DAML-S file. 2) Click on the checkboxes to select the supported services. The corresponding DAML-S file is generated automatically.

16 New Search Command New Search Panel –AgentId field The server search engine returns a list of the agents whose AgentId name contains the sub-string entered in the AgentId field. An empty sub-string will return a list of all registered agents. –Service field The server search engine returns a list of the agents whose Service names contains the sub-string entered in the Service field. An empty sub-string will return a list of all registered agents. –Search Results field The server search engine returns a short description of each agent matching the search parameters in both fields: AgentId AND Service. These short descriptionss are displayed in the Search Results field.

17 Server DOM Tree Database Hashtable: –Key = AgentId –Value = DOM tree generated from DAML-S description –Database Persistence: Each DAML-S service description is saved into a separate file. The DAML-S filenames are saved into an XML file (see example below)

18 Server Search Engine Simple Matching Algorithm –The DAML-S service request is converted into a DOM tree. –The search engine extracts the profile:serviceCategory and profile:name ELEMENTs from every DOM tree. –For each service advertisement, the values of the extracted ELEMENTs are compared with those of the service request. –A match is declared if the service request value is a sub- string of the service advertisement value in both ELEMENTs: profile:name AND profile:serviceCategory.

19 Matching Algorithm

20 References A. Ankolekar, M. Burstein, J.R. Hobbs, O. Lassila, D.L. Martin, S.A. McIlraith, S. Narayanan, M.Paolucci, T. Payne, K. Sycara, H. Zeng. DAML-S: Semantic Markup For Web Services. M. Paolucci, T. Kawamura, T.R. Payne, K. Sycara. Semantic Matching of Web Services Capabilities.