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From these two SCDL documents, you can see that all the components are implemented in Python (as specified by the implementation.python elements) and the composite services are exposed using the REST binding. These choices are not mandated by the SCA runtime; any of the components could be implemented in any of the languages supported by the runtime, which currently includes C , Python, Ruby, and PHP for the Tuscany Native runtime. For instance, the sample includes a Ruby implementation of the POPChecker component that could be swapped in to replace the Python implementation. Equally, the choice of bindings used to expose a composite as a service can be easily changed, simply by altering the SCDL. For example, the Alerter Composite could also be exposed as a SOAP Web Service.