A model contract and model integration language for integrating geography models in distributed environment

This paper presents the model contract and the model integration language, which is used for sharing and reusing geography models in a distributed geography modeling environment. The model contract mainly consists of three parts, the model external description information, the model internal structural information and the model execution flow information. Geographer can structure the model contract to invoke shared models and method to simulate the geography phenomenon using the model integration language. The model integration language is a kind of markup language to express the model contract.