惟一的标识符，可以与blog记录或者用记录表示的其他Web资源的URI一样简单，也可以像真正的128位全球统一标识符(GUID)那样复杂。
A unique identifier, which can be as simple as the URI of a blog entry or other Web resource represented by an entry, or as complex as a truly unique 128-bit Globally unique identifier (GUID).
惟一的标识符，可以与blog记录或者用记录表示的其他Web资源的URI一样简单，也可以像真正的128位全球统一标识符(GUID)那样复杂。
A unique identifier, which can be as simple as the URI of a blog entry or other Web resource represented by an entry, or as complex as a truly unique 128-bit Globally unique identifier (GUID).
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