Object-oriented implementation of the metabolic pool model

Simulation models must be clear in their concepts and design to be useful tools for ecological research. To facilitate clear and efficient model development, we present a modelling framework (OOMP) based on the concepts of the metabolic pool model and on object-oriented programming techniques. Modellers can use OOMP: (1) to increase productivity through the safe reuse of existing code; (2) to produce clear and more understandable code; (3) to prolong the life-span of their model through easier code maintenance; and (4) to enhance scientific communication through the use of a common conceptual and technical framework. We first explain the concepts of the metabolic pool approach and summarise the terminology of object-oriented design (OOD) and then show how OOMP reflects both. Finally, we discuss the advantages of OOD over earlier programming methods and compare our modelling framework with others. OOMP offers a selection of generic modelling components that the modeller can refine and combine to build a desired model. Modellers can make use of OOMP (1) as a technical platform for model development or (2) as a source of OOD principles that can benefit any modelling project.