Reuse and lifespan · The lifespan classification · Element

The spend rule

What each class is worth spending.

The part

What it is

Evergreen work justifies research, editing and production that topical work does not, because the cost is divided across years rather than days.

Without a stated rule, every piece is produced to the same standard, which overspends on the short-lived and underspends on the lasting.

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.