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。
While one can deliberate forever the best data model for the XML syntax, I believe it completely misses the point because every object-based API shares the same basic pros and cons.
尽管人们可以继续商讨对xml语法来说哪种数据模型最好，但我认为没有多少意义，因为各种基于对象的API其优点和不足基本上是一样的。
Since the user is not using a tree-based object model to access this part of the document, constructing the entire tree would lead to a waste of memory due to replication of data.
因为用户不使用基于树的对象模型来访问这部分文档，所以构造完整的树会因为数据重复而浪费内存。
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