SCTP负责使用内嵌的heartbeat机制来监视联合的路径；在检测到一条路径失效时，协议就会通过另外一条路径来发送通信数据。
SCTP monitors the paths of the association using a built-in heartbeat; upon detecting a path failure, the protocol sends traffic over the alternate path.
支持的特性包括内嵌转换、剪裁路径、alpha蒙板、光栅过滤效果、模板对象和(理所当然)可扩展性。
The feature set includes nested transformations, clipping paths, alpha masks, raster filter effects, template objects, and (of course) extensibility.
where 子句包含一个小型的路径表达式，该表达式从每个地址向下定位到其内嵌的 zip 元素。
The where clause contains a small path expression that navigates from each address to its nested zip element.
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