Delete last 15 chars from a file

["Shaun" <shaunthornburgh@xxxxxxxxxxx>]

Hi,

I am trying to create an XML file, it will be done in stages so if the file 
isn't present I will add the line:

<?xml version="1.0" ?>
    <root_element>

Then for each line I add I add the following

        <child_element>data<child_element>

But for various reasons the application won't know when the file is complete 
so it won't have the final:

    </root_element>

To solve this I intend to add the following each time

        <child_element>data<child_element>
    </root_element>

and delete the </root_element> every time I add a new 
<child_element>data<child_element>. Can anyone tell me how I can delete the 
last 15 characters from a file every time I open the file?

Thanks for your help 

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