Data_Type:1234567890    data data data    data data
Data_Type:1237834810    data data    data data    data

##</code><code>##

			open(IN,'file.txt');
			while($line = <IN>)
			{ 
			    chomp $line;
($id, $description)### regex expression to split it
push(%hash{$id, $descriptions)### then a push?
}