[tw] How to induce a variable into a Macro?

[Jan]

Hello,
I wanted to write a Macro which compose the link to a presentation based 
on fields and a tiddler. This works fine for the entire path already, 
but i do not manage to get the name ppp of the presentation into the 
macro. How do I do this?

   \define presentationlink()
   [[$(pname)$|$(videosource)$$(seminar)$/$(thema)$/P/$(pname)$]]
   \end
   \define prsnt(ppp)
   <$vars videosource={{Videosource}} seminar={{!!seminar}}
   thema={{!!thema}} pname=$(ppp)$>
   <<presentationlink>>
   </$vars>
   \end
   <<prsnt ppp="MiseEnScene.pps">>

Thanks for Help
Jan

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