column 标记的 name 属性定义将被映射到 Employee 数据成员的列名。
The name attribute of the column tag defines the name of the column to be mapped to the Employee datamember.
这可以像数据库中的记录表示形式一样简单，其中包括列名称与XML标记之间的映射，XML中的元素值包含行值。
This could be a thing as simple as a representation of a record in a database that consists of a mapping between column names and XML tags, where the element values in the XML contain the row values.
嵌套的<c:out> 标记利用EL内置的Map 收集支持来查找与列名称相对应的行数据。
Nested <c:out> tags take advantage of the EL's built-in support for Map collections to look up row data corresponding to column names.
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