This paper presents an approach for incorporating data integrity and data confidentiality into the Model-Driven Development (MDD) of process-driven Service-Oriented Architectures (SOAs) based on the OMG SoaML. Specifications for service interfaces are extended by UML activities to model invocation protocols. An invocation protocol makes the control and the object flows between service invocations explicit. Integrity and confidentiality attributes are used to annotate the object flows. The annotations serve for generating security-aware execution artefacts (e.g., interface description documents, deployment descriptors, and middleware configurations).