The sources · The source map · Element

The holders

Which systems hold each fact.

The part

What it is

Including spreadsheets, which hold more organisational facts than anyone acknowledges and are updated by hand.

Where three systems hold the same fact, at least two of them are wrong at any given moment.

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.