A substantial part of the economic theories is based on conversion and exchange process. This process can be described as a value chain, which can be considered as a cyclic model with complex attributes. There is a serious problem how to express resources and their conversions in a complex cyclic model during the simulation and how to identify these converted resources in every step of the simulation. This paper introduces the Objectvalued Petri (OV-PN) modification as a new formalism to create a cyclic model of the value chain. According to the modification we had to define a new path and pass of the OV-PN. We also had to determine new properties. Properties are based on the OV-PN and reflect needs of model requirements. A new formalism is verified on a common enterprise value chain.
The paper deals with the value modelling of business processes using the REA ontology. This ontology, which has its roots in accounting systems, provides a comprehensive framework to business process modelling. The REA ontology is focused on modelling values of resources of business processes. A business process model, which uses this ontology, introduces two levels of abstraction - the operational level and the policy level. That fact allows a greater range of possibilities of usage compared to standard modelling methods. The paper describes the use of domain-specific modelling to create a modelling tool based on the REA ontology. This approach allows creating a tool that uses specific properties of the ontology to ensure validation of the model and automatic source code generation.
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