Hello Siebe,
the understanding of a Sotapanna as per Tipitaka is mentioned above by Lal (AN 6.97).
I want to add that a Sotapanna is a sanditthiko (one who can see “San”). Without effort I can clearly “see” other people engaging in san-activities and I feel not the slightest urge to do that too.
I really do not want to offend you. When I look at your comments in this forum, you often use the term “believe” or “belief”. You like to chat about concepts/ideas. But do you contemplate on Dhamma and grasp the meaning? Because this is what I did and I reached stream entry in that way. There is no need to “know” all the finest details given in the Tipitaka. It is sufficient to learn the “big picture” and to contemplate on that, incl. the Tilakkhana. This will bring one to samma ditthi and magga phala, there is no way out.