Feb 10
This is a usual question of all beginners.
ownerid, userid and groupid are set to wiki_pages table to differentiate them when any combination of groupmode or studentmode is set.
userid is a foreign key to Moodle users table. It contains the user id who edited that wiki page version.
If the current wiki is a separated groups or a visible groups activity. groupid is set to distinguish a page called “Moodle”between the several course groups.
ownerid is used to set a property relationship between the user and a wiki page. This is needed when any student mode is set and we allow users to edit pages belonging to other people.

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