This jihad etiquette is not written down, and for good reason. It varies as much in interpretation and practice as extremist groups vary in their goals. But the rules have some general themes that underlie actions ranging from the recent rash of suicide bombings in Algeria and Somalia, to the surge in beheadings and bombings by separatist Muslims in Thailand.
Interesting yet disturbing story on the rules of Jihad. This is a wonderful example of how the letter of the law can be used to circumvent the spirit of the law as Jihadists turn prohibitions on violence against civilians into permission.