就是以元素作为子元素的那个对象。
扩展元素必须允许将xsl: fallback作为子元素。
Extension instructions must allow XSL: fallback as a child element.
组件元素也可以有零个或多个生产者元素作为子元素,它们用于配置组件的生产者。
The component element can also have zero or more producer elements as children which are used to configure the producers of the component.
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