B09 · Reference edition 2026.11
Four-flap folders — Recording and revision
A four-flap folder encloses a flat item through an ordered sequence of folds. The overlap arrangement determines access and closure.
Scope and purpose
A reference record should allow another reader to reconstruct the intended description. Keep the identifier, context and revision together. When information changes, explain the change and retain enough of the earlier description to understand what was superseded.
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
Number the lower, side and upper flaps on the reference diagram.
| Reference record | Interpretation |
|---|---|
| B09 | Four-flap folders |
| Scope and purpose | A four-flap folder encloses a flat item through an ordered sequence of folds. The overlap arrangement determines access and closure. |
| Limits and interpretation | A closure sketch does not establish the suitability of a board or adhesive. |
Review checklist
Check the identifier; describe the observation and its source; date the revision; link affected figures; distinguish confirmed facts from open questions.