The following specific architectural principles for design and service definition focus on specific themes that influence the intrinsic behaviour of a system and the style of its design:
Service Encapsulation - A lot of existing web-services are consolidated to be used under the SOA Architecture. Many a times, such services have not been planned to be under SOA.
Service Loose coupling - Services maintain a relationship that minimizes dependencies and only requires that they maintain an awareness of each other
Service contract - Services adhere to a communications agreement, as defined collectively by one or more service description documents
Service abstraction - Beyond what is described in the service contract, services hide logic from the outside world
Service reusability - Logic is divided into services with the intention of promoting reuse
Service composability - Collections of services can be coordinated and assembled to form composite services
Service autonomy – Services have control over the logic they encapsulate
Service optimization – All else equal, high-quality services are generally considered preferable to low-quality ones
Service discoverability – Services are designed to be outwardly descriptive so that they can be found and assessed via available discovery mechanisms[7]
