Is there a way that I can put my anonymous subroutines down in the bottom of my file out of the way like I do with regular subroutines and then put the line where I call it somewhere higher above?

Yes and no.

• No - anonymous subroutine must either be defined directly in the parameter list or else assigned to a variable which is passed as a parameter. Variables have to be assigned before they are used, if you want them to have a value other than undef
• Yes - you don't have to use anonymous subroutines to pass in a subroutine. You can also pass the address of a named subroutine as a parameter. To get the address, prefix the subroutine name with \& and pass it like this foo(\&someNamedSub). You can also assign the address to a variable and pass it like this: my $x=\&someNamedSub; foo($x);. And, of course, you can define named subs below the place where you call them.
• Yes - if you want to pass a closure instead of a plain old named sub, but you still want the closure generation process "down below", you can define a named generator function below. When you need the closure you call the generator and pass its result, like this:

     foo(make_a_closure(".xml"));
     #or
     my $x=make_a_closure(".xml");
     foo($x);
  
     sub make_a_closure {
       my ($sExt) = @_;
       return sub { ...#do something with $sExt }
     }
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Best, beth