It may indicate a homogeneous population exists but allows for future system growth, or it may reflect that the element is largely a default condition.

这可能表明使用了同类的填充，但是允许系统在将来增加，或者可能反映出元素基本上是默认的条件。

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If this condition is true, then the command in the element will be executed.

如果该条件为真，那么将执行元素中的命令。

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We assign the type for this alternative to be xs:error to signal that if this condition is satisfied, the element is invalid.

我们将这个替换的类型指定为 xs:error 以表示如果条件得到满足，元素就是无效的。

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