I always place the package declaration on the first line of a module file. But you can put it anywhere you really want. According to perlmod:

       Typically it [package] would be the first declaration in a 
       file to be included by the require or use operator.  You 
       can switch into a package in more than one place;
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Jeff

R-R-R--R-R-R--R-R-R--R-R-R--R-R-R--
L-L--L-L--L-L--L-L--L-L--L-L--L-L--