The service specification is a formal representation of a "service" that is both a concrete and physical representation.

服务规范是 “服务” 的形式化表示，是具体的物理的表示。

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The key point is that this is a lossless transformation, information is preserved while the physical representation is changed.

关键的是这是一种无损转化，物理表示在改变时，信息是不变的。

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Canonical XML lets you create a physical representation of an XML document that allows for the variations in XML syntax without changing the meaning.

规范化XML (Canonical XML, c14n)使您能够创建在符合xml语法规则变体中保持语义一致的XML文档物理表示。

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The building was created as a physical representation of democracy.

VOA: special.2010.01.27

In each of the examples above, we witness the compelling effect of data transformed from an abstract state to a physical representation on a map, instantly bringing it to life.

FORBES: Why Animated Data Maps Work So Well