B21 · Reference edition 2026.11
Loose-sheet supports — Definition and boundaries
An enclosure for loose sheets should distinguish the stack, support and access margin. Handling needs differ from those of a bound volume.
Scope and purpose
Start by separating the named concept from adjacent concepts. Use the observation below to identify the question the record is intended to answer. Read the caution before applying the example. A definition is useful only when another reader can tell what falls outside it.
Working notes
This collection describes enclosure forms, access routes and documentation practices for paper-based material. It is intended for reading and planning, not for directing treatment of fragile objects. Fold diagrams and record examples are original illustrations with no associated collection or accession data. Material descriptions distinguish observed features from documented properties. Decisions about a real object, its condition and its environment require the relevant professional judgement.
Practical example
Show the support edge and the preferred lifting region outside the image area.
| Reference record | Interpretation |
|---|---|
| B21 | Loose-sheet supports |
| Scope and purpose | An enclosure for loose sheets should distinguish the stack, support and access margin. Handling needs differ from those of a bound volume. |
| Limits and interpretation | Do not treat the sheet count as a reliable substitute for stack thickness. |
Review checklist
Write a one-sentence scope statement; identify a neighbouring concept; record what the example does not establish.