What is personalised · The inventory · Element
The elements
What varies.
The part
What it is
Recommendations, ordering, content selection, messaging, pricing and defaults. The last two are the most consequential and the least discussed.
Including personalisation in emails and notifications, which is frequently owned separately.
The smallest level
The attributes it carries
Each attribute is one of the framework’s shared types. What a date is, and how it is written, is defined once for the whole model — the note here says what it means in this particular place.