当对象后来从其字节串重建时，内存中新建的对象与原对象具有相同的结构和值，但位于不同的内存地址。
When the object is later re-created from its byte string, it will be a new in-memory object identical in structure and value to the original, though located at a different memory address.
但空间数据具有数据量巨大，结构复杂，属性数据与空间数据密切相关，并随其反映的地理特性不同而具有不同的数据类型等特点。
Spatial data have the characteristics of huge quantity, the high correlation between attribute data and spatial data, and the different data types with the different reflective geographical entities.
两个匿名结构或联合包含具有相同标识符但具有不同类型的成员声明。
Two anonymous structures or unions contained member declarations with the same identifier but with different types.
两个匿名结构或联合包含具有相同标识符但具有不同类型的成员声明。
Two anonymous structures or unions contained member declarations with the same identifier but with different types.
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