Technical question about a piece of code in Pro Apache book: rewrite maps

[rota regi <rotaregi@xxxxxxxxx>]

Page 293 , the author gives an example of nestling rewrite maps

1)RewriteMap giftojpg txt:/usr/local/apache/rewritemaps/gif_to_jpg.map

2)RewriteMap jpgtopng txt:/usr/local/apache/rewritemaps/jpg_to_png.map

3)RewriteRule ^(.*)/([^/]+)\.gif $1/${jpgtopng:${giftojpg:$2|$2}|$2}.jpg

Should the line 3 not be like this:

RewriteRule ^(.*)/([^/]+)\.gif $1/${jpgtopng:${giftojpg:$2|$2}.jpg|$2}.png