A node object has three central attributes.

一个节点对象有三个主要属性。

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In a long series of studies, psychologists have shown that when people are reminded that they will one day die, they fixate on attributes they consider central to their self worth.

在一个漫长的系列研究中，心理学家已经证实，当人们被提醒自己某一天会死时，他们就会更加坚定自我价值的核心属性。

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Content and attribute declarations cannot depend on attributes or element context (this is also a central problem of DTDs).

内容和属性声明不能依靠属性或元素上下文(这也是DTD的主要问题)。

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