How to setUserData through server-side xml

In other words, what’s the format of the xml, for the user data.

All my forms are generated by server-side xml and loaded to the dhtmlxform.
I tried

and on the client, I use form.getUserData(“l1”,“n”), but get an empty string.

Thanks in advance.

Hi

here is a demo
dhtmlx.com/docs/products/dht … rdata.html