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The [[Service Reusability Principle|Service Reusability]] principle dictates that services should be designed to maximize reuse. Similarly, the [[Service Composability Principle|Service Composability]] principle advocates designing services so that they can be composed into various ways.<ref name='servicecompositions'>[http://www.whatissoa.com/p12.php service compositions]</ref> Both principles require that a service contain only a specific type of logic e.g., either reusable or process-specific logic.<ref name='SOAMag'>
[[Thomas Erl]].[http://soa.sys-con.com/node/645271?page=0,1 Introducing SOA Design Pattern][Online].Date accessed:6 April 2010.</ref> Restricting each layer to a particular functionality, simplifies the design of the service.<ref name='WK' />
==Usage==
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