Explanation/Reference:
ORA does have a special relationship with SOA. ORA embraces service-orientation as a core tenet to improve agility, rationalize functions and data, and promote reuse in an effective manner. The entire strategy of SOA is not core to ORA (not C), but the concept of exposing data and functionality as interoperable SOA Services is core to ORA.
ORA must provide interoperability across all Oracle products and must also effectively deal with the heterogeneity that exists in IT environments. SOA Services provide a clean, consistent approach to deal with both of these complexities. This is the reason that ORA includes service orientation as a core tenet.
Stated as an architecture principle, this becomes:
* The architecture embraces services as the primary mechanism for interoperability and integration.
Reference: Oracle Reference Architecture and Service Orientation, Release 3.0