Looks for the internal id bound to the external key in map. The resolution will be done with keySize bytes of what key points to, where keySize is the parameter that was used in the mapCreate call. If a binding is found, *id is assigned the value of the internal identifier and
XK_SUCCESS is returned. If no appropriate binding is found,
mapResolve returns XK_FAILURE. If id is NULL, only the error code is returned.
XkReturn mapResolve(Map map, void *key, void **id)