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Service-oriented architectures have evolved to support the composition and utilisation of heterogeneous resources, such as services and data repositories, whose deployment can span both physical and organisational boundaries. The SemanticWeb Service paradigm facilitates the construction of workflows over such resources using annotations that express the meaning of the service through a shared conceptualisation. While this aids non-expert users in the composition of meaningful workflows, sophisticated middle-ware is required as service providers and consumers often assume different data formats for conceptually equivalent information. When syntactic mismatches occur, some form of workflow harmonisation is required to ensure that data format incompatibilities are resolved, a step the authors refer to as syntactic mediation.
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