Modern business performance management (BPM) comprises modeling, analyzing and monitoring of business processes. A variety of different approaches for business performance management have emerged recently. One issue common to these approaches is the inability to link the business process schema to the information gathered during the relevant phases. In this paper, we present a Petri net-based approach for process-oriented business performance management. Our approach is based on a new type of high-level Petri nets, so called XML nets. In XML nets business process objects, performance indicators and the performance measurement system are represented with XML. Being a consistent and comprehensible methodology for the whole process life cycle, XML nets support integrated process-oriented business performance management. We will also demonstrate the modules and basic functions of a Petri net-based software prototype designed to support process-oriented BPM.