XML provides a surface syntax for structured documents, but imposes no semantic constraints on the meaning of these documents.
XML提供了表示结构化文档的表层语法，但没有对文档的含义施加任何语义约束。
It's true that not having a car imposes some constraints, but owning one also complicates life in many ways.
事实就是没有车会产生一些不便，但是拥有一辆车在某些方面也将生活变的更加复杂。
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