B11 · Reference edition 2026.11
Drop-spine boxes — Definition and boundaries
A drop-spine structure provides a supported opening route. Interior clearances and hinge behaviour should be described independently.
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 closed, opening and supported-open views of the same reference structure.
| Reference record | Interpretation |
|---|---|
| B11 | Drop-spine boxes |
| Scope and purpose | A drop-spine structure provides a supported opening route. Interior clearances and hinge behaviour should be described independently. |
| Limits and interpretation | Do not force the lid or spine of an actual enclosure to match an illustration. |
Review checklist
Write a one-sentence scope statement; identify a neighbouring concept; record what the example does not establish.