inline int nsDBHash(const std::string& ns) {                                                                                 
    int hash = 7; 
    for (size_t i = 0; i < ns.size(); i++) {                                                                                 
        if (ns[i] == '.')                                                                                                    
            break; 
        hash += 11 * ns[i];                                                                                                  
        hash *= 3;                                                                                                           
    }
    return hash;                                                                                                             
}