Dr.S.Thamarai Selvi,
Professor & Head,
Dept of Information Technology,
Madras Institute of Technology, Anna University,
Chennai

Objective
To develop a Front End Tools for Semantic Grid Services that enables
 the Service Requester to search a particular Grid Service
Semantically.
 the Service Provider to describe a Grid Service Semantically.

Activities
 Study of current version of Globus Toolkit and study of
Semantic Grid Services


Understand the grid architecture and study of globus toolkit.
Study of languages needed to implement semantic grid services.
 A prototype model for semantic grid services


Extending the UDDI registry to include semantic advertisements using TModels.
Design and Development of algorithms for intelligent discovery of grid services.
 Design and Development of Grid Resource Portal
 Functional testing and optimization of implementation

Road Map

Understanding various Components of Globus Toolkit 4.0

Understanding Semantic Web Services.

Understanding the technology used to develop Semantic Web
Services.

Understanding Semantic Grid Services.

Developing a typical prototype for Semantic Grid Services.

The Semantic Grid is an extension of the current Grid in which information is given a welldefined meaning, better enabling computers and people to work in cooperation
Semantic
Grid

Layered Architecture of Semantic Grid

 Data/Computation Layer
This layer deals with the way computational resources are allocated, scheduled and executed .
 Information Layer
* This layer deals with the way that information is represented, stored, accessed, shared and maintained.
* Information equipped with meaning

Knowledge Layer
This layer deals with the way knowledge is acquired, used, retrieved, published and maintained to achieve particular goals and objectives


We need tools and infrastructure to automate the creation of ontology of knowledge present in the Grid environment.

Matchmaking of semantic web services can be done in OWL-S but it pose problems when comes to Grid.

Methods are required to build large-scale ontologies and tools deployed to provide a range of ontology services.

Knowledge capture tools are needed that can be added as plugins to a wide variety of applications and which draw down on ontology services.

Development of Front End Tools for Semantic Grid
Services
To enable Semantic Search of Services
To enable Semantic Description of Services

General Architecture Implementing for Semantic Grid Services
Semantic
Component

Semantic Component



 Ontologies are used to capture knowledge about some domain of interest.
 Ontology describes the concepts in the domain and also the relationships that hold between those concepts
 Complex concepts can therefore be built up in definitions out of simpler concepts.

Ontology Web Language (OWL) is widely used to create
Ontology
Ex : Protégé, an OWL editor


Direct interaction with Protégé knowledge bases.
 AlgernonKB interface is adaptable to other data sources.
 Algernon commands not only retrieve and store slot values, but can also modify the ontology .
 KB values can be passed to external functions written in Java or LISP, or can execute UNIX shell commands.

Though OWL has a well-defined semantics, but it is not sufficiently expressive to characterize and describe services
So,

OWL-S is an OWL-based grid service ontology, which supplies a core set of markup language constructs for describing the properties and capabilities of grid services in unambiguous, computer interpretable form

Automation Enabled by OWL-S
Find me a shipping service that transports goods to Dubai.
Buy me 500 lbs. powdered milk from www.aavin.com
Arrange food for 500 people for 2 weeks in Dubai.
Has the powdered milk been ordered and paid for yet?


Though OWLS has WSDL2OWLS , but it cannot convert
Grid WSDL to OWLS.

It cannot recognize WSRF specific WSDL elements. Hence we need to compromise while using the tool WSDL2OWLS

Challenges in OWLS
Difficultie s
Currently there is no tool available to create Grid Service Ontology automatically from its WSDL file
Solution
We need to create Service Ontology using Protégé Editor

Proposed Architecture
Grid Portal
Uses Algernon API to interact with
Ontology
We use Algernon
Reasoner
Semantic Component Protégé editor to create Ontology
Portal
Portlet
User Interface
JAVA
Interface
Reasoner
Knowledge
Base
Portlet
Grid Middleware
Node1 Node 2 Node 3
Grid Environment
The Grid Environment is built using Globus Toolkit.
Each and Every Grid Node presents a Grid Service

Program Model of the Architecture
Grid Service Provider registers in MDS
This component contains required implementation for discovering the service
Grid Service Provider
Describe Semantically using WSDL2OWLS
Semantic Component
Converts the user query and sends to semantic component processing the request
Results Delivered
Globus
Container
Service Invocation
Service
Requester
Gridspher e
Portal
Submits
Query

Program Model – Service Provider
Grid Service Provider
Submit WSDL file with Additional
Information
Registering service
MDS
WSDL2OWLS
Converter
OWL
File

Program Model – Service Requester
Results
OWL file
Queries
JAVA-OWL interface
Algernon
Query
Tokeniser
Semantic Component
Submits Query
Service
Requester

Future Work…
 Study of Web Service Execution Framework.
 Study of Semantic Matchmaking Algorithm.
 Analysis of Various Inference Engine.
Ex:Pellet , Jena , OWL Reasoner
Estimated Duration 75 days

Vision….

Need to Extend the Capability of Globus Toolkit to describe Grid
Service Semantically. It is decided to Integrate Globus Toolkit with
Protégé to enable the Service Provider for creating Service
Ontology.

Decided to develop a tool to convert WSDL written for Grid into
OWLS file and thereby enabling to apply Matchmaking mechanism.

Screenshots

Grid Portal prompting to select the type of user

Grid Portal for Service Provider

Service Provider after submitting WSDL file

Service Requester portlet to submit query

Portlet Displaying the results

The portlet invoking the Service

OWLS editor using WSDL2OWLS tool

OWLS editor with WSDL2OWLS tool
After converting into OWLS

OWLS editor showing Profile, Service, Grounding and Process

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