D-BUS documentation, where it is?

Hello everybody, I am getting started with firewalld and I've read most of the documententation which was user oriented. Right now I am looking for the D-BUS interface and somewhere some kind of API documentation or other online resource about how to deal with the firewall via D-BUS. Could someone tell me how to find it? I've really googled for it and had no results. Additionally "man 5 firewalld.dbus" isn't avialable on my local fedora, either on several internet pages which have broken links :( Example of broken link: http://linuxmanpages.net/manpages/fedora19/man5/firewalld.dbus.5.html Thank you in advance! Víctor R. Escobar