Introduction to
Service-Orientation
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Service-Orientation
Design Principles
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Effects of Service-Orientation on the Enterprise
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Service-Orientation
in the Real World
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Service-Orientation Design Principles
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Standardized Service Contract
"Services within the same service inventory are in compliance with the same contract design standards."
Services express their purpose and capabilities via a service contract. The Standardized Service Contract design principle is perhaps the most fundamental part of service-orientation in that it essentially requires that specific considerations be taken into account when designing a service’s public technical interface and assessing the nature and quantity of content that will be published as part of a service’s official contract.
A great deal of emphasis is placed on specific aspects of contract design, including the manner in which services express functionality, how data types and data models are defined, and how policies are asserted and attached. There is a constant focus on ensuring that service contracts are both optimized, appropriately granular, and standardized to ensure that the endpoints established by services are consistent, reliable, and governable.
Figure: Using Web service contract documents (WSDL, XML schema, and WS-Policy definitions) as an example, this illustration highlights the areas that are typically affected by the application of this design principle.
Chapter 6: Service Contracts (Standardization and Design) is dedicated to exploring this design principle in detail.
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