1. W3C Workshop WS-Policy in the Web Service Architecture
October 2004

2. Web Services Model Broker (UDDI) Consumer Provider FindService
PublishService
FindServiceRequest
FindServiceResponse
PublishServiceMetadata (e.g. WSDL location)
Consumer
CreatePurchaseOrderRequest
Create Purchase Order
SOAP/HTTP
CreatePurchaseOrderResponse
Provider

3. Web Service Architecture Constraints
Described Interfaces
Design by contract
“Describe the messages, not the code”
Message-oriented
Messages exchanged in a platform independent way
Loosely Coupled Services
Decentralized authorities for developing, deploying, extending, versioning and discovering services
Loosely Coupled Protocol Specifications
Modular and composable
Services use any combination of protocol specifications
“mix and match”

4. WS-* Specification Architecture
Security
Reliable
Messaging
Transactions
Messaging
WS-Policy,…
Metadata
XML
Protocols

5. WS-Policy within WS-*architecture
Framework for expressing Web service capabilities and requirements
WSDL is limited in its ability to do this
Increases the fidelity of the contract
For describing
Security
Reliable Messaging
Transactions ….
Applies to everything in the architecture
Endpoints
Protocols
Protocol specifications
WS-Policy scope bounded by the architecture
Contract
WSDL
MEPs
XML Schema
Message Formats
Domain
Policies
WS-Policy
Constraints
&
Capabilities

6. WS-Policy Usage Scenarios
Used by Provider
Provider Configuration
Validation
Used outside of Provider
Consumer Configuration
Discovery (UDDI)