* Returns value associated with supplied identifier
*
* @param identifier Identifier of value
* @return value or null, if identifier is not present in namespace.
*/
@Nullable V get(@Nonnull K identifier);
* Returns value associated with supplied identifier
*
* @param identifier Identifier of value
* @return value or null, if identifier is not present in namespace.
*/
@Nullable V get(@Nonnull K identifier);