ogf-soku workshop 08/05/2007 pinar alper. oscar corcho, paolo missier, ioannis kotsiopoulos, ian...

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 ManagingMetadata 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”RealizationsGrids Defined

Not near the ambitious OGSA landscape (cross-cutting requirements)Brittle against changesRequires experts for many activities

There’s 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 Uptake Diversity

•PARSIMONIOUS

•EXTENSIBLE

•UNIFORM

•ENGLIGHTENMENT

•MULTIFORM Metadata

•MIXED Ecosystem

6SOKU Workshop, 08 May 2007

Semantic OGSA

The Reference Semantic Grid Architecture : Semantic OGSAEntities in the Semantic GridCore Services, Spectrum of capabilitiesPatterns & Profiles of use, re-factoring, use-cases

Model

CapabilitiesMechanisms

provide/consume expose

use

7SOKU Workshop, 08 May 2007

S-OGSA Model

Knowledge Entity

Grid Entity Semantic Binding

Is-a

0..m0..m

1..m

Grid Resource

Is-a

Grid Service

Is-a

Is-a

1..m

Knowledge Resource

Knowledge Service

Is-a

Is-a

Is-a

VOOntology

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!

9SOKU Workshop, 08 May 2007

Optimization

Execution Management

Resourcemanagement

Data

Security

Information Management

Infrastructure Services

Application X Application Y

OG

SA

Sem

antic

-OG

SA

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

SBSB

SB

create

Query w/o Inference, UpdateContent

Query( over unified view)

WS-RP: Get/Set/Query Properties

WS-Addressing: epr

RDFRDF

create

query

Inspect-props . . .

query

Semantic Binding Service Suite

WS-RL: Destroy , SetTerminationTime

WS-RL ++: archive

WS-Notif: Subscribe / Notify

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 DescribedSemantic 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!

AcknowledgementsCarole GobleDave De RoureOscar CorchoOntoGrid Consortium

http://www.ontogrid.eu