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Standardized service contract : ウィキペディア英語版
Standardized service contract
The standardized service contract is a software design principle〔(Design Principle )〕 applied within the service-orientation design paradigm to guarantee that service contracts〔(Service Contracts )〕 within a service inventory〔(Service Inventory )〕 (enterprise or domain) adhere to the same set of design standards. This facilitates standardized service contracts across the service inventory.〔Michael Poulin.(Evolution of principles of Service Orientation: Service Contract, part 2 ).Date accessed: 12 April 2010.〕
==Purpose==

The agility promised by a service-oriented architecture (SOA) is usually measured in terms of the reusability level of its contained services. However, this reusability relates directly to the way the service contract defines service capabilities. A service built on a potentially reusable functional context〔The boundary of the service, i.e., the type of functions the service provides 〕 but with a contract that does not convey this reusability correctly does not achieve its reusability potential.
Within service-oriented solutions, a service contract represents a fundamental artifact, as this is the only medium through which services interact with each other or other consumer programs. This creates a strong need to standardize the service contracts in order to make services reusable and recomposable as much as possible. In order to achieve this, the standardized service contract design principle needs to be applied as its application results in standardized service contracts that are based on design standards〔Tost. et al.(Guidelines for Using Web Service Contract Technologies ).Date accessed: 12 April 2010.〕 as set within a service inventory.
One of its goals is to reduce the need for data transformations as two services interact with each other, which can be achieved if the service contracts use standardized data models e.g. XML schemas if the services have been implemented as web services. This also helps in making services more interoperable. Another important goal of this design pattern is to use a standardized way of expressing service capabilities so that their purpose and ability can be easily understood at design time.〔kou-Kai Lin.(A preliminary study on Service-oriented migration for a small-scale migration. ).Date Accessed: 10 April 2010.〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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