: Heterogeneous and proprietary interchange formats pose a major problem for business process management. This applies in particular to processes that have been modelled as Event-Driven Process Chains (EPCs). This paper addresses heterogeneous representations of EPCs. We take ARIS Markup Language (AML)1 , the proprietary interchange format of ARIS Toolset, as a starting point and discuss its advantages and shortcomings. Afterwards, we propose a mapping from AML to EPC Markup Language (EPML) and discuss the implementation of these mappings as a XSLT transformation program. The mappings reveal that all major AML elements can be transformed to similar EPML elements. Furthermore, the XSLT program makes EPC models managed by ARIS Toolset available in EPML format.