XBL component value is not shown in the email PDF attachment

I'm using the workflow-send buttom to save data and submit an email. In this email the other values in the form are shown but the value of the XBL component doesn't show.
Why doesn't show this value? What I am missing in the XBL component?
I attach the XBL component that it's not shown the value in the email:
dni.xbl
dni.js
dni.css