GetPublicId returns the public identifier for the current document event.

getPublicId返回当前文档事件的公共标识。

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The section in blue is called the public identifier, the green part is the system identifier, which is a URI.

蓝色的部分是公有标识符；绿色的部分是系统标识符，它是个URI。

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Lastly, the DOCTYPE entry allows us to refer to a particular DTD without using the formal public identifier or an actual filename.

最后，DOCTYPE项允许我们引用特殊DTD，而不需要使用正式公共标识或实际的文件名。

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