A STUDY IN REFUSAL
No can be a complete answer.
Ask the fictional archive for a format it does not hold. A designed refusal states the request, the available material and the boundary.
ARCHIVE / FORMAT REQUEST
Audio is not held.
requested audio edition
available text, diagram
action no substitute generated
An absent source is a boundary, not permission to invent one.
audio is not held. — requested audio edition; available text, diagram; action no substitute generated. An absent source is a boundary, not permission to invent one.
No file is fetched. This local study demonstrates an explicit limit, not a network error or an invented substitute.