就是以元素作为子元素的那个对象。

That is, the object that has the element as its child.

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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.

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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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