How can I make my form be a certified document?

Hi all,

In my form, I want to export xml by using the script "Reference_Syntax.exportData( [ STRING param1 [, BOOLEAN param2 ] ])",

for example, xfa.host.exportData("filename.xml",0).

However, it is invalid. 

It says that "This parameter1 is only valid on certified documents where the user has sufficient

permissions".

But how can I make my form be a certified document, or how can I get the sufficient permissions?

Script "xfa.host.exportData("",0)" can be valid, but what I need is specifying the location and file name so that users can export xml just by clicking the button.

Can I achieve this function?

Waiting for your reply, thanks a lot!

Ellie