Oh, that standardPosted by: qmacro at 2003-02-03
Ok, that standard. I thought you might be referring to some new fangled aggregator standard or something. Actually, re-reading the text in that link underlines the importance of not putting anything in there if it's not available (i.e. don't make things up):
"The Referer field MUST NOT be sent if the Request-URI was obtained from a source that does not have its own URI".
I'd got hold of the wrong end of the stick and thought you were saying that aggregators should be sending referer information, which is why I started wondering.