Object relational mapping refers to the technique of mapping the data representation from an object model to a relational data model with a SQL-based schema.

用基于 SQL 的模式可以把数据呈现从对象模型映射到关系数据模型，对象关系映射引用了这项技术。

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The document Object Model specifies a tree-based representation for an XML document.

文档对象模型为XML文档指定了树型表示。

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It transforms the flat, character-based state representation from the URL into a hierarchical object representation (the document model introduced above).

它会将普通的基于字符的状态表示形式从url转换为层次结构对象表示形式(上面介绍的文档模型)。

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