The nine layers that go into an SOA Reference Architecture, as described in The SOA Source Book, by Dr. Chris Harding (of The Open Group):
Operational Systems Layer: Existing application assets and other programs.
Service Components Layer: Software components that help to perform services and may leverage existing assets.
Services Layer: The services that are in the service portfolio, and hence available for use in solutions, including through discovery and composition.
Business Processes Layer: Business processes, and service compositions that they use, including orchestrations and choreographies.
Consumers Layer: The people and external systems that participate in the business processes, and their interfaces to the services.
Integration Layer: Integration of other building blocks.
Quality of Service Layer: Quality aspects of system operation.
Information Layer: Building blocks whose functions are concerned with the transformation and management of data.
Governance Layer: Building blocks such as governance rules and procedures, and services and programs that support the application of the rules and the operation of the
procedures.
Operational Systems Layer: Existing application assets and other programs.
Service Components Layer: Software components that help to perform services and may leverage existing assets.
Services Layer: The services that are in the service portfolio, and hence available for use in solutions, including through discovery and composition.
Business Processes Layer: Business processes, and service compositions that they use, including orchestrations and choreographies.
Consumers Layer: The people and external systems that participate in the business processes, and their interfaces to the services.
Integration Layer: Integration of other building blocks.
Quality of Service Layer: Quality aspects of system operation.
Information Layer: Building blocks whose functions are concerned with the transformation and management of data.
Governance Layer: Building blocks such as governance rules and procedures, and services and programs that support the application of the rules and the operation of the
procedures.
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