what's this

Hello,

My code validates for XHTML, but it has the following note along with it:

Note: The HTTP Content-Type header sent by your web browser (unknown) did not 
contain a "charset" parameter, but the Content-Type was one of the XML text/* 
sub-types (text/xml). The relevant specification (RFC 3023) specifies a 
strong default of "us-ascii" for such documents so we will use this value 
regardless of any encoding you may have indicated elsewhere. If you would like to use a 
different encoding, you should arrange to have your browser send this new 
encoding information. 

I have a "charset" parameter in my code just like some of your web page codes 
have. In, to make it more confusing, the page for validation does not have a 
"charset" parameter in it.

Also, I tried validating the CSS part of my code. There were no errors, but 
there were parsing problems with the required DOCTYPE code.

Please enlighten me and others as to what this is all about.

Thank you for your time.