Right, if we're talking about what this could be like then it's instructive to consider what a client would look like that supported this natively. For example,

Right, if we're talking about what this could be like then it's instructive to consider what a client would look like that supported this natively. For example, we might have a "petname" tag that a browser could use to display a petname link like so: <petname ref="pet:4f30b43ec38b43c3abad5d422125900f" proposed_name="Google" /> The browser would then display this in the same way mentioned in the OP; if you already have an entry locally it shows your local name, otherwise it shows the proposed name and marks it as such.