[Cppcms-users] Why hello_world::main() gets called automatically?

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Hi!

The original example "Hello, World!" code follows:
------------------
class my_hello_world : public cppcms::application {
public:
    my_hello_world(cppcms::service &srv) :
        cppcms::application(srv) 
    {
    }
    virtual void main(std::string url);
};

void my_hello_world::main(std::string /*url*/)
{
    response().out()<<
        "<html>\n"
        "<body>\n"
        "  <h1>Hello World</h1>\n"
        "</body>\n"
        "</html>\n";
}

int main(int argc,char ** argv)
{
    try {
        cppcms::service srv(argc,argv);
        srv.applications_pool().mount(cppcms::applications_factory<my_hello_world>());
        srv.run();
    }
    catch(std::exception const &e) {
        std::cerr<<e.what()<<std::endl;
    }
}

-------------

What I don't understand is why member function

void my_hello_world::main(std::string)

is called automatically when client requests the URL.

I changed the member function name "main" to "xmain" as below, then it stops working:

-------------
class my_hello_world : public cppcms::application {
public:
    my_hello_world(cppcms::service &srv) : cppcms::application(srv) 
     {
     }
    virtual void xmain(std::string url);
};

void my_hello_world::xmain(std::string /*url*/)
...
-------------

 Does this belong to cppCMS coding convention or something else?

Best Regards,

CN