Listing 21 shows the three lines added under the component element, LoginServiceComponent.

清单21显示了在component元素下添加的三行代码LoginServiceComponent。

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You can also associate requirements with an element by using the Show requirements icon on the element's toolbar (Figure 21).

您也可以通过使用元素工具栏上的Show Requirements图标，来将需求与元素联系起来(图21)。

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With the qualified name for the new element, and the namespace URI from the existing element, I can then create the new element (lines 20-21).

利用新元素的限定名称，以及现有元素中的名称空间uri，我就能创建新元素(第20 - 21行)。

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In 2008 it partnered with Element 21, a Canadian golf-club maker, to develop processes to slice and encapsulate the aerogels into something apparel makers could use.

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