CGW ‘06Krakow, October 16th 2006

Semantic Binding Specificationsin S-OGSA

www.ontogrid.eu

Oscar Corcho, Pinar Alper, Ioannis Kotsiopoulos, Paolo Missier, Sean Bechhofer, Carole Goble

S-OGSA

Semantic-OGSA (S-OGSA) is...Our proposed Semantic Grid reference architectureA low-impact extension of OGSA

• Mixed ecosystem of Grid and Semantic Grid servicesServices ignorant of semanticsServices aware of semantics but unable to process themServices aware of semantics and able to process (part of) them

• Everything is OGSA compliant

Defined by • Information model

New entities

• CapabilitesNew functionalities

• Mechanisms How it is delivered

Model

Capabilities Mechanisms

provide/consume

expose

use

Semantic Binding

Explicit representation of metadata associated to Grid entities

Association betweenA Grid EntityA Knowledge Entity

S-OGSA Model. Semantic Bindings

Optimization

Execution Management

Resourcemanagement

Data

Security

Information Management

Infrastructure Services

Application 1 Application N

OG

SA

Sem

antic

-OG

SA

Semantic Provisioning

Services

From OGSA to S-OGSA

Ontology

ReasoningKno

wle

dge

Metadata

Annotation

Sem

antic

bin

ding

Semantic Provisioning Services

Lifetime

MetadataService

OntologyService

Service

ResourceMetadataSeekingClient

S-OGSA Patterns

Properties

Others….

Access/Query MetadataRefers to

Resource props

S-OGSA Patterns

Lifetime

MetadataService

OntologyService

Service

ResourceMetadataSeekingClient

Properties

Others…

Access/Query Semantic Bindings

Refers to

Get Semantic Binding Pointers

2

1Resource

properties

S-OGSA Patterns

Lifetime

MetadataService

Service

ResourceMetadataSeekingClient

Properties

Others…

Access/Query Semantic Bindings1Semantics

1.1

Farm out request

Semantic aware interface

OntologyService

Requirements for... Semantic Binding Services

What happens if... ...any or all of the Grid entities it refers to disappears?

• Instrument and planning files for satellites do not disappear• Insurance contracts, cars, repair companies, etc., may

disappear ...the Knowledge entities disappear or evolve?

• Ontologies may change ... a SB is no longer available (its content is not useful any

more)? • Damage claims: add witness reports, improve info about

location... When do/should SBs become invalid? How often should

this be checked? What is the status of the content of a SB (e.g., content

checked, stable, unchecked, etc.)?

Semantic Binding Lifetime. WS-SBResourceLifetime

ContentRefsProbablyStale

Stable

Destroyed

updatedOntology

Stale

Archived

SB Checked: stale

destroyedOntology

SB Checked: OK

archive

External Event

Internal Event

destroy

and it disappears

GridReferencesOutdated

destroyedGridEntity

updateGridEntityRefs

allGridEntitiesDestroyed

updateSBContent

SB Checked: stale

scheduledUpdate [time]

updateSBContent

updatedGridEntity??

destroy

archive

Other pieces of work

Grid OntologyBased on the work done in UniGrids

EnlightenmentSemantic Grid Services evolution patterns

• Design patterns• S-OGSA profiles

Examples of successful scenarios

More information

Publications An overview of S-OGSA: a Reference Semantic Grid Architecture. Corcho

O, Alper P, Kotsiopoulos I, Missier P, Bechhofer S, Goble C. Journal of Web Semantics 4(2):102-115. June 2006

Deliverable D1.2 v2. To be available for download at www.ontogrid.eu in October 2006.

Semantic Binding Specifications in S-OGSA. Cracow Grid Workshop 2006. October 2006.

Source code (next release in October 2006) http://www.ontogrid.eu/, For Downloading Distributions Access to CVS

Connection type: pserveruser: ontogridpassword: not neededHost: rpc262.cs.man.ac.ukPort: 2401Repository path: /local/ontogrid/cvsrootmodule: prototype

Questions

Thank you for your attention!

Questions?

AcknowledgementsOntoGrid Consortium,John Brooke, Michael Parkin, Dean

Kuo, Donal Fellows, Viktor Yarmolenko, David de Roure