A new naming scheme may be introduced by defining a mapping onto a conforming URL syntax, using a new prefix. Experimental prefixes may be used by mutual agreement between parties, and must start with the characters "x-". The scheme name "urn:" is reserved for the work in progress on a scheme for more persistent names.
It is proposed that the Internet Assigned Numbers Authority (IANA) perform the function of registration of new schemes. Any submission of a new URI scheme must include a definition of an algorithm for the retrieval of any object within that scheme. The algorithm must take the URI and produce either a set of URL(s) which will lead to the desired object, or the object itself, in a well-defined or determinable format.
It is recommended that those proposing a new scheme demonstrate its utility and operability by the provision of a gateway which will provide images of objects in the new scheme for clients using an existing protocol. If the new scheme is not a locator scheme, then the properties of names in the new space should be clearly defined. It is likewise recommended that, where a protocol allows for retrieval by URL, that the client software have provision for being configured to use specific gateway locators for indirect access through new naming schemes.