Much recent research work discusses the transformation between different process modelling languages. This work, however, is mainly focussed on specific process modelling languages, and thus the general reusability of the applied transformation concepts is rather limited. In this paper, we aim to abstract from concrete transformations by distinguishing two major paradigms for representing control flow in process modelling languages: block-oriented languages (such as BPEL and BPML) and graph-oriented languages (such as BPMN, EPCs, and YAWL). The contribution of this paper are generic strategies for transforming from block-oriented process languages to graph-oriented languages, and vice versa.

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