ITIL business process modeling

Hi,

We are developing an ITIL based IT Service Management Solution and are currently looking for a specification language for modeling the ITIL business processes (especially  describing the process interfaces).

A common notation used in many ITIL business process modeling solutions is BPMN.However, I haven't been able to find information on the description language. Can anyone recommend me a modeling language especially suitable for modeling the ITIL business processes?

Thanks!

Br, Jani

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