Definitions · The version record · Element

The versions

Each version of the definition, with dates.

The part

What it is

Superseded definitions kept in full, since a question about a historical number requires the definition in force at the time.

How often a definition changes is itself informative: frequent change suggests the underlying concept is unsettled.

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.