I don’t believe this to be a network component, being that with the Petname System, the network acts on the raw addresses and transposes them however necessary in the user interface. The network itself will not even be aware of this functionality, so technically, this may be classified under RFC - Decentralised Naming System V - No DNS. However, if/when there are design plans for the browser (from the core devs or as an app developed separately - and I do believe there should be more than one developed) this function will be as integral a part as the url bar is in any current ones for the existing internet.