ITU‐T's Technical Reports and Specifications 663 The model web technology [b‐Nativi] is to hurdle the bars in the meta‐modeling as well as catalog registration technology, and to bridge the communication gaps between the heterogeneous sensors, models, as well as simulation and decision support systems. The model web technology could be used to solve the problems in the expression, understanding, sharing and cooperation of the heterogeneous city decision models. Users could realize the city integrated emergency decision by combining and optimizing these models on decision terminals. The framework of the model web technology used in smart sustainable cities is presented in Figure 9. Figure 9 – Framework of the model web technology used in smart sustainable cities The service web technology [b‐ESTO] is to overcome the obstacles in the workflow and sensor web technologies, and to achieve the goal of network intelligent service which is in accordance with specific sensor actions and interface specifications. The framework of the model web technology used in smart sustainable cities is demonstrated in Figure 10. Model Representation in Smart Sustainable Cities Analysis of Description Model for Models Rapid Modeling for Models Model Registration & Discovery in Smart Sustainable Cities Model Registration Model Query Model Inference Mapping from representation model to registration model and registration Automatic model match based on key words and other constraints Discover new relations between models and apply them in new fields Model Optimization and Combination Model Chain Generating Abstract Model Chain Instantiated Model Chain Instantiation Model Chain Optimization Instantiated Model Chain Optimized Model Chain Optimization Model Chain Execution Model Representation Spatio-Temporal Models in Smart Sustainable Cities Visibility analysis models Spatial statistical models Network analysis models Spatial analysis models Trend prediction models Gas diffusion models Terrain analysis models Optimization models ...