OGF-SOKU Workshop 08/05/2007 Pinar Alper. Oscar Corcho, Paolo Missier, Ioannis Kotsiopoulos, Ian Dunlop, Wei Xing, Sean Bechhofer, Carole Goble Semantic OGSA: A Framework for Exposing and Managing Metadata in the Grid Outline: OGSA, Next Generation Grids, SOKU S-OGSA Desiderata S-OGSA in a nutshell S-OGSA instantiations Middleware Application SOKU & S-OGSA

2SOKU Workshop, 08 May 2007 OGSA re-visited Cross cutting requirements Interoperable VO level Optimized Reliable Certain QoS Guarantee Scalable Available Extensible Secure Low Administrative costs Self-* Characteristics Service Based Virtualisation Manageable Resources Addressing State Lifetime Eventing.....

3SOKU Workshop, 08 May 2007 Reality Virtual Homogeneity Realizations Grids Defined Not near the ambitious OGSA landscape (cross-cutting requirements) Brittle against changes Requires experts for many activities Theres room for automation!

4SOKU Workshop, 08 May 2007 Next Generation Grids & Metadata Glossaries. File names. File headers. Directory naming conventions Code libraries. Type systems. Schemas. Data formats. Best practices. Documentation. Applications Policy definitions. Service level agreements Implicit Metadata Embedding and implicit metadata is the enemy of shareability and reuse in an open and decoupled and collaborative environment. Make it explicit !

5SOKU Workshop, 08 May 2007 S-OGSA Desiderata CONCEPTUAL Ease of UptakeDiversity PARSIMONIOUS EXTENSIBLE UNIFORM ENGLIGHTENMENT MULTIFORM Metadata MIXED Ecosystem

6SOKU Workshop, 08 May 2007 Semantic OGSA The Reference Semantic Grid Architecture : Semantic OGSA Entities in the Semantic Grid Core Services, Spectrum of capabilities Patterns & Profiles of use, re-factoring, use-cases Model Capabilities Mechanisms provide/ consume expose use

7SOKU Workshop, 08 May 2007 S-OGSA Model Knowledge Entity Grid Entity Semantic Binding Is-a 0..m 1..m Grid Resource Is-a Grid Service Is-a 1..m Knowledge Resource Knowledge Service Is-a VO Ontology Rule-Base Is-a Satellite Image File A Grid Identity/Person Is-a Journal of Web Semantics, Vol.4, June 2006, An overview of S-OGSA: A Reference Semantic Grid Architecture Ó. Corcho et. al. A Resource in its own right!

8SOKU Workshop, 08 May 2007 Grid Ontology

9SOKU Workshop, 08 May 2007 Optimization Execution Management Resource management Data Security Information Management Infrastructure Services Application XApplication Y OGSA Semantic-OGSA Semantic Provisioning Services S-OGSA Capabilities Middleware Ontology Reasoning Metadata Annotation Semantic Provisioning Services

10SOKU Workshop, 08 May 2007 Middleware for Managing Metadata Semantic Binding as a resource deployed in a WSRF compliant manner DEMO at e-Science stand! SB Factory Client Semantic Binding Metadata Query SB create Query w/o Inference, UpdateContent Query( over unified view) WS-RP: Get/Set/Query Properties WS-Addressing: epr RDF create query Inspect- props... query Semantic Binding Service Suite WS-RL: Destroy, SetTerminationTime WS-RL ++: archive WS-Notif: Subscribe / Notify

11SOKU Workshop, 08 May 2007 Managing Metadata State observed through resource properties. State changes disseminated via notification Semantic Binding Service WS-Notif. [state] WS-Notif [lastModificationTime] Client Grid Entity Knowledge Entity Update- [content] Client Query-RP [state] Stable Stale GE changed KE changed Archived Deleted subscribe

12SOKU Workshop, 08 May 2007 ActON- Semantic Information Service for the EGEE Grid Information integration from gLite and GT4 information services BDII RGMA MDS Capabilities Complex Queries Common View over Different Models Coping with dynamism: Materialisation with update on demand Demo at eScience Stand!

13SOKU Workshop, 08 May 2007 File Management in Satellite Missions Grid

14SOKU Workshop, 08 May 2007 S-OGSA & SOKU Explicit Semantics! Semantically Described Semantic Aware Mixed Economy Creating an abstraction for metadata Semantic Binding Multiform metadata with introspectable properties Management interfaces for metadata S-OGSA--OntoKit, a first SOKU implementation ** ** Quoted from David De Roure

15SOKU Workshop, 08 May 2007 Acknowledgements & Questions Thank You! Questions... Please visit our demos at the eScience stand! Acknowledgements Carole Goble Dave De Roure Oscar Corcho OntoGrid Consortium

16SOKU Workshop, 08 May 2007 Semantics Inside Service Oriented Knowledge Utility Dynamic assemblies Semantically described Semantically capable Immediately usable NGG3