我应该在重新分配给分配到保留属性自动释放对象的释放？
Should I call release on an autorelease object assigned to a retained property before reassigning it?
此集合中的属性包括全局属性、环境变量、保留属性以及导入属性。
The properties in this collection include global properties, environment variables, reserved properties, and imported properties.
名称空间建议书文档本身将这些声明当作保留属性，这些声明长得足以介绍它们。
The Namespaces Recommendation document itself refers to these declarations as reserved attributes long enough to introduce them.
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