I dunno, but here is a bump. I bet ShirleyW does!!!
I was wondering the exact same thing yesterday!!!
Do you mean for extensionwork? Stringwork is the strings you pipe so they lay against the cake, like garlands.
Theresa 
I always thought/read the bridge work was made from multiple layers of royal icing that you go over with a damp paint brush to join. At least that's how they describe it in the Australian and English books I have. I've never heard/read of anything regarding paper so this will be interesting...........
Bridges can be made in many ways, but I've never heard of paper. It may have been used to make the pattern on the cake.
You can make bridges with pieces of dried gumpaste pieces (fancy cut), bridgeless (too long to explain), or as one person said, piping a small line of Royal Icing around the cake and then piping up to at least 6 more lines directly on top of that. After each line dries, of course. Otherwise, the bridge will droop. Once the entire bride has dried (overnight) then you should paint thinned royal over the lines to fill in the spaces. Then you can get to actually making the strings.
Best of luck to you. I suggest that no one be home when you try this. 
Michele
Well there was one other technique that I think I saw in a ACD magazine I think where they used fondant pieces cut to shape and curved on say a flower former (or something the correct shape) and then they placed those around the cake and attached the strings to that.
What sugarflowers was saying is what I've read but not with the set "6" times. To me it would depend on how far you want the stringwork to extend out, but I've never tried any of this, just read it.
Toba actually has a tutorial on this in her Creative Cookies book but it's very brief and I've not had success with it to date 
I ordered a copy of Cake Craft and Decoration, March issue. Inside is a lesson on extension work. The author, Charitha Fonseka, uses straight pins, greased with vegetable fat, stuck in the fondant to hold the RI as she pipes the loops for the bridge. Once dried, leaving the pins still in, she does the extension work. When it is hard, she removes the pins, re-greases them and re-inserts them for the next round. Makes it look so much easier!
The bridge is out of royal that is layered with a 3 tip maybe 4 to five times. The paper is what I think is used for the guide.
Accounting roll of paper is the perfect size to make a pattern on your cake with a pin.
You take the rolled paper and measure around the cake. then you fold it up and cut an arch on the bottom. you put the paper on the cake with pins and trace and then you will have the perfect amount of arches around your cake and you have a guide for the string work. I hope this made sense?
PennySue...I think that is what Michele was referring to as "bridgeless" extension work...there is nothing that hooks the bottom of the strings to the cake itself?
also has an explanation in the well-decorated cake book.
Correct. It sort of just flows out from the cake itself, like a string ruffle.
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