front end - How can I determine the hyperlink of a currently opened documentation page programmatically?

Every pages in the documentation has a hyperlink. Here are some examples:

"paclet:ref/NotebookRead"
"paclet:guide/GraphStylingAndLabeling"
"paclet:tutorial/ListsOverview"

Well, my question is:

If I open a docs page, then how can I get the hyperlink of it programmatically?

my tries

Till now, I can get the NotebookInformation of documentation notebooks (if it exist):

Select[NotebookInformation /@ 
     Notebooks[], ("DocumentType" /. #) == "Help" &]

The output might be:

{{"FileName" -> 
   FrontEnd`FileName[{$RootDirectory, "C:", "Program Files", 

 "Wolfram Research", "Mathematica", "9.0", "Documentation", 
 "ChineseSimplified", "System", "Tutorials"}, "ListsOverview.nb", 
     CharacterEncoding -> "CP936"], 
  "FileModificationTime" -> 3.56977*10^9, 
 "WindowTitle" -> "List - Wolfram Mathematica", 
"MemoryModificationTime" -> 3.58634*10^9, 
  "ModifiedInMemory" -> True, "DocumentType" -> "Help", 
 "StyleDefinitions" -> {NotebookObject[
    FrontEndObject[LinkObject["d5i_shm", 3, 1]], 46]}}}

But I don't know what to do next. The correspondence between the FileName and hyperlink seems to be confusing.

Answer

Not very sophisticated but works so far:

nb = (Select[Notebooks[], ("DocumentType" /. NotebookInformation[#]) == "Help" &])

"uri" /. Options[Options[#, TaggingRules][[1, 2]], Metadata][[1, 2]] & /@ nb

{"tutorial/SettingUpFunctionsWithOptionalArguments"}

Please tell me if this works for you too.

Edit

Shorter one:

nb = (Select[Notebooks[], ("DocumentType" /. NotebookInformation[#]) == "Help" &])
Cases[Options /@ nb, HoldPattern["uri" -> x_] :> x, Infinity]

{"guide/Calculus"}

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