This is useful when the widget exposes some configuration parameters that directly affect the mark-up or if the mark-up must be conditionally produced depending on external preferences.

在小部件公开某些能直接影响此标记的配置参数时，或是这个标记必须要依照外部首选项而有条件地生成时，这一点将会很有用。

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When all the equipment in a building is fully networked and interactive, when building systems can react to internal and external changes and demands to traffic, pricing and preferences, and to safety threats and hazards--all effortlessly, seamlessly and, critically, in the background, in ways facilities' managers and homeowners will tolerate--true intelligence and true efficiency will have arrived to the chaotic building sector.

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