One identity · The matching · Element

The identifier

What the matching relies on.

The part

What it is

Email, account number, phone or a device identifier. Each has different persistence and different availability at different points in the journey.

An identifier available only after purchase cannot help with anything before it, which is where most of the anonymity problem sits.

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.