Modelio has demonstrated its BPMN models interoperability at OMG :

SOFTEAM/Modeliosoft confirms its commitment to modeling standards (UML, BPMN, SysML, UPDM, TOGAF,  …) through its continuous participation efforts in OMG and Open Group, and to model interchange groups.
Interoperability is guaranteed through the OMG XMI exchange support, and the BPMN XML support. In addition, Modelio supports Excel™ import/export, and has an XML framework allowing to interoperate with most third party tools, including non-standard modeling tools.