Protocol is the etiquette of diplomacy and affairs of state.
A protocol is a rule which guides how an activity should be performed, especially in the field of diplomacy. In the diplomatic and government fields of endeavor protocols are often unwritten guidelines. Protocols specify the proper and generally-accepted behavior in matters of state and diplomacy, such as showing appropriate respect to a head of state, ranking diplomats in chronological order of their accreditation at court, and so on.
Break of Protocol - example:
I understand that you will be in the United States in mid-November for a gathering at Falls Church, Virginia. Considering the difficulty and expense of such a journey, I hope that during your visit you might be willing to pay a call on me, so that we might begin to build toward such a missional relationship. If that is a possibility, I hope you will contact this office as soon as possible.
If you were a diplomat involved in international relations, can you see where the new Presiding Bishop breaks protocol? How many forms of protocol does she break? Can you name them all?
And we wonder why Americans have such a terrible reputation abroad.