[openbox] Including files in rc.xml

[John]

Hello,
I have a huge list of key bindings in a file that I would like to 
include in rc.xml so I can maintain the file separately, thus keeping 
rc.xml as vanilla as possible.

I can't work out how to do this. Is it possible?

XML isn't my strength. I tried (without success)

<!DOCTYPE openbox_config [
<!ENTITY keybind_file SYSTEM "keybindings.xml">
]>

and then including the file at the right point


&keybindfile;

The file just contains loads of keybind blocks.

Thanks for your help!