For W3C-defined elements and attributes, use the prefixes that the W3C USES.

对于W3C定义的元素和属性，使用W3C所用的前缀。

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Locally defined elements can only appear in the context of the element definition in which they are defined.

局部定义的元素只能出现在定义它们的元素定义上下文中。

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If you define two Rule Set extensions with the same ID, then the Rule Set will include all defined elements of both extensions.

如果您定义两个规则集扩展有着相同的ID，那么这个规则集将包含这两个扩展中定义的所有元素。

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But we've defined the enthalpy of those elements in their stable state at room temperature and pressure as zero, right?

但我们已经定义了这些,元素处于它们室温和常压下,最稳定的状态时的焓为零，对吧？

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Even within one well defined operation, the number of elements you need to measure is very complex in terms of data and interactions with suppliers.

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