DocumentMode is when a Wiki contribution is written in the third person and left unsigned. The piece of text is community property; it may have multiple and changing authors as it is updated to reflect the community consensus. This is in contrast to ThreadMode, comments which are usually signed and in the first person, and rarely edited by people other than the one who signed them.
Wiki excels at DocumentMode. Many pages start off with an OpeningStatement which declares a piece of wisdom.
see also DocumentMode, DocumentMode