The sentence

The statement itself, in final wording, treated as fixed until formally revised.

The part

What it is

This is the artefact people quote. Because it will be quoted from memory and reproduced in slides, the exact wording matters more than it would in a longer document.

Holding it fixed is the point. A sentence that is paraphrased differently by each department has already stopped being one statement.

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.

Text
Fixing the wording is what stops the purpose drifting through paraphrase.
Statement shared type
Language
A translated purpose can shift in meaning; knowing the source settles disputes.
Choice shared type
Word count
A crude but reliable check — growth over successive versions signals unresolved thinking.
Number shared type