此流程元素是个容器，类似于BPEL范围活动。
This process element is a container, like a BPEL scope activity.
元素是jsp容器已知的元素类型的实例。
An element is an instance of an element type known to the JSP container.
Body元素是必要信息的容器。
根元素充当所有其他元素的容器。
穿越到下一个元素在容器中的必要信息。
Information necessary to traverse to the next element within the container.
容器及其所有子元素整个只能接收焦点一次。
The container and all of its child elements as a whole receive focus only once.
(如果有的话)获取容器内的第一个和最后一个元素。
Fetch the first and last elements from the container, if any.
(如果有的话)获取容器内的第一个和最后一个元素。
Fetch the first and last elements from the container, if any.
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