Kannel OTA malforms package with certain XML

[Kasper Nielsen]

When sending this XML from NowSMS, everything works:

var xml = ' \
<?xml version="1.0"?> \
<!DOCTYPE wap-provisioningdoc PUBLIC "-//WAPFORUM//DTD PROV 1.0//EN" "
http://www.wapforum.org/DTD/prov.dtd";> \
<wap-provisioningdoc> \
    <characteristic type="BOOTSTRAP"> \
        <parm name="NAME" value="APN TEST"/> \
    </characteristic> \
    <characteristic type="NAPDEF"> \
        <parm name="NAME" value="APN Test"/> \
        <parm name="NAPID" value="APN_Test_NAPID"/> \
        <parm name="BEARER" value="GSM-GPRS"/> \
        <parm name="NAP-ADDRESS" value="internet"/> \
        <parm name="NAP-ADDRTYPE" value="APN"/> \
        <parm name="INTERNET"/> \
    </characteristic> \
</wap-provisioningdoc> \

But Kannel resolves in a SMPP malformed packaged due to this single line:

        <parm name="NAP-ADDRESS" value="internet"/> \

If I remove this single line Kannel are able to ship the SMS without errors.

Googling seems the OMA standard does allow this line. What can the error be?
I have tried to type the line manually, avoiding any special characters
from copy-paste.