664 ITU‐T's Technical Reports and Specifications Figure 10 – Framework of the model web technology used in smart sustainable cities 3 Integrated management for smart sustainable cities 3.1 Overview With the continuous development of smart sustainable cities, the categories and forms of information resources are greatly expanded. A large number of heterogeneous information resources, like nodes, sensors, observations and events, are involved in IMSSC. The relationship of these information resources is complicated, sometimes complementary, reinforced or redundant. However, there is no technical proposal to manage them in an integrated way so that the redundant information can be eliminated, the weakness of one kind of information resources can be supplemented by another, and several information resources can be combined together to fulfil the tasks more effectively. A technical proposal for IMSSC is put forward in Figure 11. In this proposal, the sensors, observations, models and nodes are encoded and managed in a uniform way in advance, and when events occur, the service center will invoke the sensors, observations, models as well as the nodes to perform the corresponding missions as predefined.