You've obviously just posted a snippit of your code, but do you know that XML::Simple can process a file without having to read it in first: 
#untested
use XML::Simple;
my $sales_channel_output = XMLin( $sales_channel_input );

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Unless I state otherwise, all my code runs with strict and warnings

In reply to Re: How to resolve this error "Unrecognised option" if i use XML::Simple ? by FunkyMonk
in thread How to resolve this error "Unrecognised option" if i use XML::Simple ? by Anonymous Monk

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