An XML "value," computed by a query expression, may consist of zero, one, or many items, each of which may be an element, an attribute, or a primitive value.
由查询表达式计算出来的XML“值”，可为零项、一项或者多项，而其中每一项可以是一个元素、一个属性或一个原始值。
You can configure the Fan Out mediation primitive to fire its output terminal just once or once for each element obtained using a specified XPath expression.
您可以配置 Fan Out 中介原语，以仅触发其输出末端一次，或对使用指定 XPath 表达式获取的每个元素都触发一次。
For example, you can configure a message Filter mediation primitive to route messages down one of multiple paths, depending on whether a particular XPath expression holds true.
例如，可以配置一个Message Filter中介原语，以根据某个特定XPath表达式的值(是否为真)来按多种路径之一传递消息。
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