A Conceptual Architecture for Semantic Web Enabled Web Services Christoph Bussler, Dieter Fensel, an

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A Conceptual Architecture forSemantic Web
Enabled Web ServicesChristoph Bussler, Dieter
Fensel, and Alexander Maedche
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Outline

• Introduction
• SWWS Requirements
• Web Service Modeling Framework
• SWWS Conceptual Architecture
• Summary and Outlook

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Introduction

• Vision of Semantic Web Enabled Web Services
  (SWWS)
• SWWS will transform the Web from a static
  collection of information into a distributed
  device of computation on the basis of Semantic
  Web Technology making content within the WWW
  machine-processable and machine-interpretable.
• A Conceptual modeling framework and an associated
  conceptual architecture

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SWWS Requirements

• Document types
• Describe the content of business documents
• Syntax
• Documents can be represented in different
  syntaxes available
• Semantics
• Semantic descriptions to be interpreted correctly
  by the service requestors and providers
• Transport binding
• An agreement between service requestor and
  service provider on the transport mechanism to be
  used for service requests
• Exchange sequence definition
• Transport-level communication protocol to follow
  in inherently unreliable data communication
  networks
• Process definition
• a manifestation of business logic in terms of the
  business messages exchange sequence.
• Security
• Each message exchange between service requester
  and service provider should be private and
  unmodified

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Web Service Modeling Framework (WSMF)

• Ontologies
• Provide the terminology used by other elements
• Goal repositories
• Define the problems that should be solved by web
  services
• Web services descriptions
• Define various aspects of a web service
• Mediators
• Bypass interoperability problems

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SWWS Conceptual Architecture
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SWWS Components

• Centralized coordinator and manager
• Manages all other components in the components
  layer
• Discovery
• Allow to support discovery of SWWS
• Audit/tracking
• Allows to track the different service providers
  and consumers to provide means for auditing
• Trading partner manager
• store trading partner profiles, agreements
• Negotiation
• Exploit the semantics available within SWWS
• Security
• authorization and authentication of users,
  channel security management, message security via
  encryption/decryption, signing, or sequence
  numbers

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SWWS Components

• Workflow, Web service, Ontology, Goal Manager
• Allow for standardized and simplified access to
  the underlying data and processes
• B2B Protocol engine
• A defined sequence of message exchange over
  networks
• Deployment
• Process of making the defined services available
  for service consumers
• Adapters
• Enable reusable descriptions of objects and make
  it possible to combine objects that differ in
  their syntactical input and output descriptions
• Transport
• Implements the network and protocol connectivity
• Semantic transformation
• Data, Business Logics, Message Exchange Protocols
  and Dynamic Service Invocation.

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Ontology and Mediation Components

• Ontology Support in SWWS
• Document types and semantics require ontology
  support
• In the architecture, ontology servers and its
  repositories are used for storing and accessing
  domain and application concepts represented in
  the form of ontologies
• Mediation Support in SWWS
• P2P communication structure require mediation
  support for the differences in document types,
  semantics, or business processes
• The semantic transformation engine provides for
  each possible mismatch a rule set that overcomes
  the mismatch (e.g CA and California)

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SWWS Scenario Processing of two messages
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Summary and Outlook

• Completed steps towards accomplishing the vision
  of SWWS
• Web Service Modeling Framework
• SWWS Conceptual Architecture
• Future work
• Map the components of the SWWS Conceptual
  Architecture to concrete technical components
• Emphasize that the framework is working and
  aligned with existing standards and proposals
  like WSDL and upcoming standards like BPEL

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Thank You !!