Using WSDL/UDDI and DAML-S in Web Service Discovery Aphrodite Tsalgatidou National and Kapodistrian...

Using WSDL/UDDI and DAML-S Using WSDL/UDDI and DAML-S in Web Service Discoveryin Web Service Discovery

Aphrodite Tsalgatidou

National and Kapodistrian University of Athens

Email: [email protected]

http://www.di.uoa.gr/~afrodite

WS Discovery: The problem …WS Discovery: The problem …

Service Provider

(1) Service Description

Service Requestor

(3) Description of Req. needs

Service Broker

(2) Publishing

(4) Matchmaking

Invocation/Binding

WS Discovery: RequirementsWS Discovery: RequirementsDescriptionDescription PublishingPublishing Description of Description of

Req. Needs Req. Needs MatchmakingMatchmaking

HOWHOW DAML-S, XML, keywords, …

Scalable, Secure, Available, …

DAML-S, XML, keywords,…

Scalable, Secure, Available, By composition, keywords, inference

WHOWHO Program,

Developer, Business user

Program, Developer, Business user



WHEN/HOW WHEN/HOW LONGLONG

N/A Persistent, With lease

N/A Design-time, run-time, persistent query, volatile query

WHATWHAT See next slide

WHEREWHERE N/A Local, Corporate, Global

N/A Local, Corporate, Global

WHAT reqs: more specificallyWHAT reqs: more specificallyW3C Stack Layer AttributesBusiness level agreements

Service level agreements

Composition Conversations, Transactions

Orchestration

Presentation Type of output (e.g. WAP)

Policy Preconditions, Effects, Domain(s), Cost, Security, Constraints (geographical, time or based on other attributes), Performance, Reliability, Information about the service provider

Implementation Description Network address

Interface Description service Name, Short service description, input/output messages, Operations, bindings, interaction pattern, synchronicity, exceptions

XML Schema

WSDL/UDDIWSDL/UDDIDescriptionDescription PublishingPublishing Description of Description of

Requestor Requestor Needs Needs

MatchmakingMatchmaking



DAML-S, XML, keywords, …

Scalable, Secure, Available, By composition, keywords, inference…

WHOWHO Program,





WHEN/HOW WHEN/HOW LONGLONG






WSDL/UDDI and WHAT reqsWSDL/UDDI and WHAT reqsW3C Stack Layer AttributesBusiness level agreements



Orchestration





XML Schema

The DAML-S approachThe DAML-S approachDescriptionDescription PublishingPublishing Description Description

of Req. Needs of Req. Needs MatchmakinMatchmakingg



DAML-S, XML, keywords,…

Scalable, Secure, Available, By composition, keywords, inference

WHOWHO Developer, Business user




WHEN/WHEN/HOW LONGHOW LONG






DAML-S and WHAT reqsDAML-S and WHAT reqsW3C stack Layer AttributesBusiness level agreements



Orchestration





XML Schema

Evaluation of DAML-S (1/2)Evaluation of DAML-S (1/2)

Issues related to the language specification

Issues inherited from the Semantic Web

Evaluation of DAML-S (2/2)Evaluation of DAML-S (2/2)

Generality of descriptions Possible inconsistency between the ServiceProfile

and the ServiceModel Lack of tools that enable the definition of all three

aspects of a Daml-s description Lawlessness in ontologies Inability to compare preconditions and effects Tricky comparison on the non-functional

attributes Maturity issue

Future WorkFuture Work Expand the survey by examining composition

and standards (such as BPEL4WS, WSCL, WSRP, …) and see how they can be combined with other standards in order to meet the specified requirements

Examine DAML-S 0.9, OWL Investigate the merging of UDDI/WSDL and

DAML-S activities Extend our discovery mechanism prototype to

address as many requirements as possible and evaluate the standards

Using WSDL/UDDI and DAML-S in Web Service Discovery Aphrodite Tsalgatidou National and Kapodistrian...

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