Abstract: A method of mapping abstract identifier implementations organized into namespaces may be used by parties (e.g., software developers) to combine identifier implementations with maximum flexibility, producing high-performance abstract code tailored to different application requirements and host binding environments. By expressing a bound entity via a parenthetical construct, multiple different implementations of the same abstract identifier can be uniquely identified and coexist together within the same program. A similar technique can also be used to uniquely identify extensions to existing types and namespaces developed by external parties without causing binding name clashes.