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AC11 Institute Analysis — AC11_Institute_IFC2x3.ifc Guardrails

Foundation: BBC · DATA_MODEL · BIM_COBOL · MANIFESTO · TestArchitecture

699-element institutional building — 5 storeys, IFC2x3. German office/lab complex validates multi-storey institutional extraction with ArchiCAD 11.

Stone: candidate #5 (German institutional — IFC2x3 ArchiCAD export) Created: 2026-03-20 (session 38b preparation)

Building Identity

Property Value
Name AC11 Institute
IFC version IFC2X3
Country Germany
Authoring tool ArchiCAD 11
Type 5-storey institutional (offices, labs, meeting rooms)
Elements 699 building elements (excluding 287 openings, 3 virtual)
Disciplines 2: ARC (doors, windows, furnishing, railing, stair), STR (walls, slabs, columns)
M_Product_Category RE (Residential)
Prefix IN
C_DocType_ID RE_IN
Reference IFC DAGCompiler/lib/input/IFC/AC11_Institute_IFC2x3.ifc
Source opensourceBIM — freely downloadable

Storey Structure

IFC Name German Proposed Code Role Seq Elevation (m)
Keller Basement KE BASEMENT 1000 -3.0
Erdgeschoss Ground Floor EG GROUND_FLOOR 1010 0.0
1. Obergeschoss 1st Upper Floor OG1 UPPER_FLOOR 1020 3.0
2. Obergeschoss 2nd Upper Floor OG2 UPPER_FLOOR 1030 6.0
Dachgeschoss Attic/Roof DG ROOF_FLOOR 1040 9.0

Space Inventory (82 rooms across 5 storeys)

Storey Spaces Room Types
Keller 17 Besprechungsraum (meeting), Technikraum (mechanical), Lager (storage), Archiv, WC
Erdgeschoss 18 Buero (office), Labor (lab), Flur (corridor), WC, Teeküche (kitchenette)
1. Obergeschoss 22 Buero, Flur, WC Damen/Herren, Bibliothek (library), Teeküche
2. Obergeschoss 22 Buero (×12 identical), Flur, WC, Teeküche — near-identical to 1.OG
Dachgeschoss 3 Dachboden (attic storage ×2), Flur Treppe (stair corridor)

Key insight: 1.OG and 2.OG are near-identical floor plates. This is the first model with typical floor repetition — a WALK-THRU stacking proof at real scale.

Element Census

IFC Class Count Names / Pattern
IfcFurnishingElement 253 55 Stuhl (chair), 52 Schreibtisch (desk), 2 Labortisch (lab table), 144 unnamed
IfcWindow 206 196× 1.0×1.5m, 6× 0.9×1.5m, 3× 0.9×2.0m, 1× 1.0×2.0m
IfcWallStandardCase 119 KE=24, EG=29, OG1=29, OG2=29, DG=8
IfcDoor 77 KE=16, EG=18, OG1=22, OG2=21
IfcSlab 26 KE=1, EG=1, OG1=1, OG2=1, DG=22 (roof structure!)
IfcRailing 12 3 per storey (EG, OG1, OG2, DG) — stairwell railings
IfcStair 4 1 per storey (KE, EG, OG1, OG2)
IfcColumn 2 EG only — ground floor columns
IfcOpeningElement 287 Window/door voids (excluded from element count)
IfcVirtualElement 3 (excluded)
Total 699 (excluding openings + virtual)

Discipline Breakdown (proposed)

Discipline Count Elements
ARC 552 253 furnishing, 206 windows, 77 doors, 12 railing, 4 stair
STR 147 119 walls, 26 slabs, 2 columns
Total 699

Materials

IFC Material Maps To
Kalksandstein Sand-lime brick — NEW (λ≈0.99, German standard)
Stahlbeton Reinforced concrete — YES (existing C30/C35)
Aluminium Window/door frames — NEW for component_library
Leer Empty/void material (ArchiCAD default) — skip

Property Sets — What's Extractable

PSet Count Value for Pipeline
BaseQuantities 229 HIGH — per-element areas, volumes, lengths
Pset_WindowCommon 206 HIGH — ThermalTransmittance on all windows
Pset_WallCommon 119 HIGH — ThermalTransmittance, IsExternal, LoadBearing
Pset_SpaceCommon 82 HIGH — per-room category, accessibility
Pset_SpaceThermalRequirements 82 HIGH — per-room thermal targets (2nd model after FK)
Pset_DoorCommon 77 ThermalTransmittance, FireRating
Pset_FurnitureTypeCommon 44 MEDIUM — furniture classification
Pset_SlabCommon 26 ThermalTransmittance
Pset_RailingCommon 12 Height, IsExternal
Pset_StairCommon 4 HandicapAccessible
Pset_ColumnCommon 2 LoadBearing, FireRating
Pset_BuildingCommon 1 OccupancyType, NumberOfStoreys

Verb Analysis (predicted → actual)

Predicted:

Verb Elements Pattern
TILE 196 windows (1.0×1.5m) Identical size, repeated across 4 storeys
TILE 55 Stuhl (chairs) Identical product, repeated in offices/labs
TILE 52 Schreibtisch (desks) Same pattern — desk per office
PLACE 119 walls Each unique position
PLACE 77 doors Each unique position
CLUSTER 26 slabs Roof structure with varying dimensions
CLUSTER 12 railings 3 per storey, stairwell groups
PLACE 4 stairs 1 per storey

Actual (FACTORIZE-v2, session 39c):

Storey Verb Patterns Instances Unfactored
Keller STR 3 100 23
Erdgeschoss STR 3 92 49
1. Obergeschoss STR 5 87 24
2. Obergeschoss STR 4 84 27
Dachgeschoss STR 1 (CLUSTER) 15 9
Total 16 378 132

Compression: 791 → 417 BOM lines (47% reduction). Scope space elements (253 furnishing) are mostly in small groups (<4 per room) and fall through to unfactored writes. The storey-level structural elements (walls, windows, doors) achieve the strongest compression.

VerbDetector ROUTE guard: dimension uniformity check (50mm tolerance) prevents roof slabs with varying heights from being forced into ROUTE patterns — they correctly fall through to CLUSTER which stores per-instance dimensions.

What's NEW for component_library.db

§1. New Material Rows (ad_material_thermal)

material_name conductivity_w_mk description source
Kalksandstein 0.99 Sand-lime brick (German standard) DIN 4108
Aluminium 160.0 Window/door frame material CIBSE Guide A

§2. New Furnishing Products

253 furnishing elements — first building with significant furniture. The pipeline will auto-create M_Product entries from extraction. Key types: - Stuhl (chair) — 55 instances, likely 1-2 unique geometries - Schreibtisch (desk) — 52 instances, likely 1-2 unique geometries - Labortisch (lab table) — 2 instances - 144 unnamed — investigate after extraction

§3. IFC Class Check

IFC Class In ad_ifc_class_map? Action
IfcWallStandardCase YES —
IfcWindow YES —
IfcDoor YES —
IfcSlab YES —
IfcColumn YES —
IfcStair YES (added in FK session) —
IfcRailing YES —
IfcFurnishingElement YES —

All 8 element types already registered. No S0a work needed.

How To Get IFC into BIM Compiler Framework

Canonical references: docs/SourceCodeGuide.md §Chapter 4 (Steps 1-5), docs/WorkOrderGuide.md §How to Add a New Building.

Step 0 — Seed databases (BEFORE extraction)

0a. Register IFC element types in ERP.db

All types already registered. No action needed.

0b. Seed materials in component_library.db

# Create migration: migration/ASM003_ac11_materials.sql
# New materials: Kalksandstein, Aluminium
# Apply: sqlite3 library/component_library.db < migration/ASM003_ac11_materials.sql

Step 1 — Extract geometry from IFC

python3 tools/extract.py --to reference \
    DAGCompiler/lib/input/IFC/AC11_Institute_IFC2x3.ifc \
    -o DAGCompiler/lib/input/Ifc2x3_AC11Institute_extracted.db

Step 2 — Inspect extracted data

DB=DAGCompiler/lib/input/Ifc2x3_AC11Institute_extracted.db

# Storeys and counts
sqlite3 "$DB" "SELECT storey, COUNT(*) FROM elements_meta GROUP BY storey"

# World bounding box
sqlite3 "$DB" "
SELECT ROUND(MIN(r.minX),2), ROUND(MAX(r.maxX),2),
       ROUND(MIN(r.minY),2), ROUND(MAX(r.maxY),2),
       ROUND(MIN(r.minZ),2), ROUND(MAX(r.maxZ),2)
FROM elements_rtree r"

# Per-space containment (IFC-driven via rel_contained_in_space)
# IfcSpace names map to BOM templates in YAML Order config

Actual results (session 39): - 699 elements, 91 geometries, 5 storeys, 82 spaces - World BBOX: X[-1.0, 43.0] Y[-2.0, 17.0] Z[-3.3, 12.049] - Per-storey: KE=162, EG=184, OG1=160, OG2=160, DG=33 - Discipline split: ARC=697, STR=2 (only columns are STR)

Furnishing containment note: Furnishing elements are contained in IfcSpaces (not IfcBuildingStorey). The extractor resolves containment through the spatial hierarchy: IfcSpace → IfcBuildingStorey → storey name. Of 699 elements: 253 furnishing in IfcSpaces, 446 structural at storey level.

Step 3 — Write classify_in.yaml

5 storeys, 82 spaces. The YAML will be significantly larger than FK (7 spaces) or SH (4 spaces).

Reference docs for BOM modelling: - docs/WorkOrderGuide.md §Schema (v1) — full field reference for storeys:, floor_rooms:, spaces: - docs/BOMBasedCompilation.md §2.1 — BOM tree structure (BUILDING → FLOOR → SET → LEAF) - docs/BOMBasedCompilation.md §Appendix G3 — avoid double-counting extracted elements as static_children - docs/SourceCodeGuide.md §Step 3 — how BOM builders create m_bom/m_bom_line from YAML - docs/FZKHausAnalysis.md §Step 3 — worked example of classify YAML with IfcSpace-derived AABBs - classify_fk.yaml — template for scope space syntax (7 spaces, 2 storeys) - classify_sh.yaml — simplest YAML (4 spaces, 1 storey)

Grouping strategy for 82 spaces → IN_BOM.db:

BUILDING_IN_STD
├── FLOOR_IN_KE_STD (Keller)          ← 17 SET BOMs
│   ├── IN_KE_BESPRECHUNG_I_SET       (Besprechungsraum I — 22 furnishing)
│   ├── IN_KE_BESPRECHUNG_II_SET      (Besprechungsraum II — 22 furnishing)
│   ├── IN_KE_TECHNIK_I_SET           (Technikraum I)
│   └── ... 14 more
├── FLOOR_IN_EG_STD (Erdgeschoss)     ← 18 SET BOMs
│   ├── IN_EG_BUERO_MEIER_SET         (Buero Meier — 2 furnishing)
│   ├── IN_EG_LABOR_I_SET             (Labor I — 10 furnishing)
│   ├── IN_EG_LABOR_II_SET            (Labor II — 11 furnishing)
│   └── ... 15 more
├── FLOOR_IN_OG1_STD (1. Obergeschoss) ← 22 SET BOMs
│   ├── IN_OG1_BUERO_SCHMIDT_SET
│   ├── IN_OG1_WC_DAMEN_SET
│   ├── IN_OG1_BIBLIOTHEK_SET
│   └── ... 19 more
├── FLOOR_IN_OG2_STD (2. Obergeschoss) ← 22 SET BOMs (near-identical to OG1)
│   ├── IN_OG2_BUERO_302_SET
│   └── ... 21 more
└── FLOOR_IN_DG_STD (Dachgeschoss)    ← 3 SET BOMs
    ├── IN_DG_DACHBODEN_1_SET
    ├── IN_DG_DACHBODEN_2_SET
    └── IN_DG_FLUR_TREPPE_SET

Total: 82 SET BOMs + 5 structural FLOOR BOMs + 5 room FLOOR BOMs + 1 BUILDING = 93 BOMs.

Key modelling decisions: 1. Furnishing in spaces, not storeys: The IFC puts furniture in IfcSpace containers. The scope space AABB must enclose the furniture. Use IfcSpace geometry for AABBs. 2. OG1 ≈ OG2: Near-identical floor plates. The YAML lists them separately (no template reuse in v1 schema), but the compiled output should show near-identical BOM structure. This is a future repeat: DSL keyword candidate. 3. Structural elements on storeys: Walls, slabs, columns, stairs, railings are contained directly in IfcBuildingStorey — they go on the structural FLOOR BOM, not SET BOMs. 4. DG has 22 slabs: The Dachgeschoss roof structure (22 slabs) is analogous to FK's 42 rafters. These are all on one structural floor BOM. 5. No static_children needed: All slabs are extracted — see BOMBasedCompilation.md §Appendix G3.

Step 4 — Write dsl_in.bim

BUILDING "Ifc2x3_AC11Institute" type:SINGLE_UNIT profile:"DE_Institutional" {
    STOREY "Keller" level:0 height:3.0m { }
    STOREY "Erdgeschoss" level:1 height:3.0m { }
    STOREY "1. Obergeschoss" level:2 height:3.0m { }
    STOREY "2. Obergeschoss" level:3 height:3.0m { }
    STOREY "Dachgeschoss" level:4 height:3.0m { }
}

Step 5 — Run pipeline

./scripts/run_RosettaStones.sh classify_in.yaml

Add RE_IN to GATE_SCOPE in BuildingRegistryTest.java before running. (See SourceCodeGuide.md §10 step 4 and BOMBasedCompilation.md §Appendix G1.)

Step 6 — Delta checks

Actual results (session 39): 9/11 PASS → Updated S100-p85: 7/7 PASS

Gate Result (S39) Result (S100-p85) Notes
IFCtoBOM Pipeline PASS PASS 93 BOMs, 791 lines, 4.5x factorization
EN-BLOC compile PASS PASS 699 elements
WALK-THRU compile PASS PASS 699 elements
Delta (EB vs WT) PASS PASS 0 element count delta
Geometry divergence PASS PASS 0 hash mismatches
Rule 8 (coords) PASS PASS All coordinates parent-relative
Clash check PASS PASS 0 furniture clashes
C9-AXISDIM PASS PASS 0 axis dimension mismatches
C8-GEODIV ~~FAIL~~ PASS Library gap resolved — 699 LOD, 0 fallback
G4-TAMPER ~~FAIL~~ PASS Code committed

C8 history (resolved): Session 39 reported C8 FAIL (6 IfcFurnishingElement mesh types lost). Furnishing LOD geometry was subsequently added to component_library.db. Fleet audit confirms 699/0/0 LOD binding (zero fallback).

BOM QA highlights: - 93 BOMs: 1 BUILDING + 10 FLOOR + 82 SET - 786 product-linked LEAF lines (699 extraction + 87 template/static) - 174 distinct products → 4.5x factorization ratio

Recompilation (S100-p85 Fleet Audit, 2026-03-28)

BOM walk recompilation via CompileStage → writeFromBomWalk(). 7/7 PASS.

Metric Value
Elements 699
Root BOM via getRootByDocSubType(IN)
Verbs 264 PLACE, 18 CLUSTER, 4 ROUTE
Disciplines ARC=286 (all LEAF lines)
LOD binding 699 LOD, 0 fallback, 0 missing
H6 WARNs 280 (MEP schedule — large building, many rooms)

LMP Drift Check: 6 pass, 0 fail, 2 deferred

§ Check Verdict
§1 Input=Output PASS (699/699)
§2 LOD400 PASS (699/699, 0 warn, 0 fail)
§3 Compiler Only PASS
§6 Output Path PASS
§7 Separate From Input PASS
§8 Visual Fidelity PASS (geometry OK)
§4, §9 Openings, Orientation deferred (no proof aggregate)

C8 status update: Session 39 reported C8 FAIL (6 IfcFurnishingElement mesh types lost). Fleet audit shows 7/7 PASS — C8 now passes. LOD binding is 699/0/0 (all elements have library geometry, zero fallback). The furnishing library gap from session 39 has been addressed by subsequent library updates.

G4 status update: G4-TAMPER now PASS (code committed since session 39).

Step 7 — Mine validation rules (deferred)

Key mining targets for future session: - Window spacing per storey (TILE proof at 196 instances) - Furniture density per room type (chairs/desks per office) - Floor-to-floor repetition (OG1 vs OG2 element-for-element match) - Wall thickness distribution (Kalksandstein vs Stahlbeton)

Step 8 — Update docs (DONE)

  • Updated this doc with extraction + pipeline results
  • Hardened SourceCodeGuide.md §10 with complete IFC onboarding recipe
  • Updated PROGRESS.md with IN session results

Preparation Checklist

  • [x] S0a: All IFC classes already registered — verified (8/8)
  • [x] S0b: migration/ASM003_ac11_materials.sql created + applied (Kalksandstein, Aluminium)
  • [x] S1: Extraction → Ifc2x3_AC11Institute_extracted.db (699 elements, 91 geometries)
  • [x] S2: Inspected: 5 storeys, world BBOX [-1,43]x[-2,17]x[-3.3,12], 82 space AABBs
  • [x] S3: classify_in.yaml — 216 lines, 82 spaces (largest YAML yet)
  • [x] S4: dsl_in.bim — 5 storeys, level:0-4, heights 3.0/3.0/3.0/3.0/2.669m
  • [x] S5: RE_IN added to GATE_SCOPE (BuildingRegistryTest + RosettaStoneGateTest), pipeline run
  • [x] S6: 9/11 PASS (session 39) → 7/7 PASS (S100-p85 fleet audit) — C8 + G4 both resolved
  • [ ] S7: Mine rules — deferred to future session
  • [x] S8: Docs updated

Comparison with Existing Stones

Metric SH FK IN DX TE
Elements 58 82 699 1099 48428
Storeys 1 2 5 2 7
Spaces 4 7 82 ~20 —
Windows 3 11 206 ~50 —
Furniture 0 0 253 0 0
TILE candidates 0 42 303 0 12
IFC version IFC4 IFC4 IFC2x3 IFC2x3 IFC4
Typology Residential Residential Institutional Residential Terminal

IN fills the gap between FK (82) and DX (1099) — it's the mid-scale stone that proves the pipeline handles multi-storey institutional buildings with real furniture, real spaces, and massive window repetition.

IN is the verb compression proof-of-concept. If 196 windows + 55 chairs + 52 desks compress to ~10 TILE patterns, the BOM factorization ratio will be the highest yet.