XMLAGG - column function that groups several elements within a parent element.
XMLAGG——将几个元素组成一个父元素的列函数。
It's based on the fact that events bubble up and can be handled by a parent element.
它基于这样一个事实：事件逐层冒泡总能被父元素捕获。
Some elements will be wrapped inside a parent element-that is, an element that fully contains another element.
有些元素被打包到父元素中—就是说，一个元素完全包含另外一个元素。
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