然而，应该理解的是，正是这一复杂性为具体元素提供了精确的定义。
However, it should be understood that this complexity provides precision in the definition of the concrete elements.
为了增强指标的可操作性，建立包含多个具体元素的网络资源数据库是有效的手段。
And an Internet resources database with many specific elements should be established to improve the operability of the indexes.
有时候类型名称在一个实例文档中使用，比如当用xsi： type指定一个具体元素的类型时。
Sometimes a type name is used in an instance document, such as when the type of a concrete element is specified with xsi: type.
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