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§20 family: Common object and entity formats, EED and proxy graphics (§20.1 to §20.3, §20.4.1, §20.4.2, §28, §29) #139
Description
Spec: ODA Open Design Specification for .dwg files v5.4.1, §20.1, §20.2, §20.3, §20.4.1, §20.4.2, §28, §29.
Sections and their state on main (2026-10-21)
| Section | State | Code | Note |
|---|---|---|---|
| §20.1 Common non-entity object format (p. 100) | closes |
src/objects/modern.rs, src/object.rs | Measured: EED, BL num_reactors, B no_xdictionary, B has_ds_binary_data (#40 documents the table path's difference). |
| §20.2 Common entity format (p. 101) | closes |
src/common_entity.rs | |
| §20.3 Object types (p. 104) | closes |
src/object_type.rs | |
| §20.4.1 Common Entity Data (p. 106) | closes |
src/common_entity.rs | Graphics-preview block (ARCHITECTURE §7f). |
| §20.4.2 Common Entity Handle Data (p. 107) | closes |
src/common_entity.rs | |
| §28 Extended Entity Data (EED) (p. 261) | closes |
src/objects/xdata.rs | |
| §29 Proxy entity graphics (p. 262) | partial |
src/objects/proxy_entity.rs | Carried as opaque bytes; not interpreted. |
closes comes from the boundary checks on the local 19-file corpus (STATUS.md, 2026-08-30). It is re-measured on the public corpus in CI by the 0.2.0 measurement epic, and no section is complete until its values equal AutoCAD's own DXF export.
Acceptance, for every section above
- Every field of its prescription is read, with every version branch the section names
- Where the section prints an example, its bytes are a committed fixture and decode to the values printed
- The field list ends on the record's exact data-stream boundary (and string/handle-stream boundaries on R2007+) on every corpus record of the type, on every release band
- Every value equals AutoCAD's DXF export of the same drawing, matched by handle (DXF group 5), with the scorer from the oracle epic
- The corpus holds at least one record of the type on each release band, R13 to R2018; a band without one is recorded on the corpus epic, not assumed
- Its row in docs/spec-coverage.md moves to
complete, with the evidence linked
Subtasks
- §20.1 Common non-entity object format
- R13
- R14
- R2000
- R2004
- R2007
- R2010
- R2013
- R2018
- §20.2 Common entity format
- R13
- R14
- R2000
- R2004
- R2007
- R2010
- R2013
- R2018
- §20.3 Object types
- R13
- R14
- R2000
- R2004
- R2007
- R2010
- R2013
- R2018
- §20.4.1 Common Entity Data
- R13
- R14
- R2000
- R2004
- R2007
- R2010
- R2013
- R2018
- §20.4.2 Common Entity Handle Data
- R13
- R14
- R2000
- R2004
- R2007
- R2010
- R2013
- R2018
- §28 Extended Entity Data (EED)
- R13
- R14
- R2000
- R2004
- R2007
- R2010
- R2013
- R2018
- §29 Proxy entity graphics
- R13
- R14
- R2000
- R2004
- R2007
- R2010
- R2013
- R2018
A subtask becomes its own issue when someone picks it up; that issue quotes the section's field list and names the corpus records it is measured on.
Parent: #138
Activity