tentatively valid (encoding) and opera uploads

i have several pages, that are wml and use the dtd "-//PHONE.COM//DTD WML 
1.1//EN" "http://www.wapforum.org/DTD/wml_1.1.xml"

these pages validate as "Tentatively Valid"

i'm validating using Opera's Ctrl-Alt-V, which uploads to the validator.
the reason for the Tentative bit is: "I was not able to extract a character 
encoding labeling from any of the valid sources......"

I understand this is supposed to be supplied by the webserver, but in my case 
the page gets to the validator using the upload facility ....

so, am i correct in thinking the problem may be Opera not sending any encoding 
info when uploading to the validator??

or have i mis-understood the problem?