Let me start with a confession. These remarks are based solely on my observations and opinions. There is no science here, no controlled experiments, not even rigorously designed cultural anthropology. I would be delighted if someone did that work, but I have not. I have nothing but anecdotal evidence, and that is severely limited by the facts that I am only one person, am fluent in only one natural language, and have only been working with document markup for about 35 years (and databases for 10 before that), and work only in the world of prose documents. If you tell me that you have different experiences, I will not only not tell you that you are not wrong, I will ask you to tell me about it. There isn’t one way this always works; there isn’t one pattern of interactions that works for everyone; there isn’t one pattern in which all markup communities interact. These are my opinions, not facts.