>> Here's a concrete suggestion: the Bing search engine and IE browser >> support this safe flag right now. Could you talk to the people >> responsible for them and ask whether they considered more fine grained >> schemes such as PICS, and why they implemented a single bit instead? > >Or, I can go to their website and see that their “bit" implements ternary logic: Bing implements the exact proposal in this I-D. (The I-D says so.) If you believe otherwise, please provide references. R's, John