Explanation/Reference:
The intent of SOA is to provide common reusable SOA Services that can be leveraged by a variety of consumers. SOA Services are made available to various types of service consumers in order to rationalize the way business functions are performed and enterprise data is managed. Its modular architecture approach promotes reuse and business agility, and the use of widely adopted technology standards improves interoperability between business solutions.
Service consumers consist of various types of business solutions, such as BPM, EDA, MDM, BI.
SOA Services can also act as service consumers.
ORA provides a framework to describe how various technology perspectives are related.
Note: The reference architecture is designed to support an expanding list of technology strategies. It is also important that the various technology perspectives can be easily combined since they are very much complementary.
ORA embraces service orientation at the core so that services provide a consistent mechanism to expose and combine various technologies and the capabilities.
A high-level conceptual model for SOA is used to illustrate how technology perspectives consume and provide SOA Services.
Reference: Oracle Reference Architecture and Service Orientation, Release 3.0