82 lines
4.6 KiB
Markdown
82 lines
4.6 KiB
Markdown
# IFC Membership And Semantic Acceptance
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2026-09-16. The current IFC4 semantic supplement passed all 13 declared proof
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areas through actual native execution. The entire 1508-requirement project is
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not complete. This result does not imply support for every IFC schema, entity
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or edit; the explicit implementation limits below remain.
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## Native Changes
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The importer now persists native object IDs and IFC GlobalIds alongside the
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embedded source file. The exporter uses them to distinguish deleted objects
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from new objects that reuse the same document name, including after FCStd
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save/reopen. Existing unchanged documents without this additional identity
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manifest remain exportable; deleting from those older documents rejects
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explicitly because the required identity mapping is absent.
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Added solid products reuse the same upstream BRep serializer and authoritative
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IFC-class mapping as authored documents. They must belong to exactly one
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imported building storey. Their generated product and containment identities
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are stable, their geometry is converted into source length units, and duplicate
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identities reject before destination commit.
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Deletion uses upstream IfcOpenShell reference removal for containment,
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property/type definitions, material/classification associations and child
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decomposition references. Empty relationships are removed when their last
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member is deleted. Shared metadata and surviving members remain intact.
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Unknown inverse relationships and deletion of spatial/decomposition parents
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reject explicitly. Source documents are not rewritten by the exporter.
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The previous background continuation's material/classification changes were
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retained and tested: existing simple material names and classification-reference
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names/identifiers can be edited consistently across shared references. The
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interrupted case integration and a missing document lookup in its rollback
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test were completed. Dependencies include the actual separate cases and
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fixtures; no untracked case input is used to award acceptance.
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## Evidence
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`business-evidence/266816da4ea763887c126a8a-20260916T023700353278.json`:
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46 scenarios, 66 passing assertions, all 13 declared proof areas and the
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unchanged independent verifier passed. Membership scenarios cover both shared
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quantity and shared association fixtures, same-name replacement, rotated native
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wall geometry, stable repeat export, undo/redo, FCStd persistence, invalid
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membership rejection, caller transaction recovery, and last-member deletion.
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`business-evidence/0ad9cfb9964462bcf78a9d2e-20260916T023807367320.json`:
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the two existing geometric IFC import/export requirements passed after the
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shared serializer change. Unrelated module cases were not rerun.
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The semantic execution took 31.962 seconds. Repeating the same selected request
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with `--reuse` took 0.340 seconds, read one proof file and executed zero cases.
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The newly added scenarios share the existing WASM instance. Only the affected
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BIM target was incrementally rebuilt; OCCT and other targets were reused.
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43 business automation tests and three snapshot comparison tests also passed.
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Intermediate failures remain in the evidence directory. A native temporary
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shared-list lifetime error was repaired. The negative empty-shape test now
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uses an actually empty new Part feature: clearing a parametric wall's cached
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shape is not invalid because document recompute regenerates it legitimately.
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## Explicit Limits
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- Tested semantic schema: IFC4. This is not an IFC2X3/IFC4X3 export claim.
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- Supported newly authored solid classes: wall, column, slab and untyped proxy.
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Other classes reject; class names never come from display labels.
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- Imported additions require one existing storey; new spatial hierarchy,
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existing-object reparenting and deletion of spatial/decomposition parents
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remain unsupported and reject.
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- Imported boolean properties, six existing simple quantity value types,
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material names and classification-reference names/identifiers are editable.
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Arbitrary new property sets, quantity sets, material structures and new
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associations are not implemented. Unsupported edits reject explicitly.
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- Deletion requires the persisted identity manifest. Export of a document
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without a remaining solid is rejected. Unsupported inverse references,
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including opening/filling relationship edits, reject rather than being lost.
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- This continuation changes native behavior and native acceptance, not a new
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browser editing UI. Existing browser import evidence is retained.
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Continue other pending business requirements using the current ledger and
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planner. Do not repeat accepted IFC tests unless relevant inputs change, and
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do not count repeated regression execution as new business delivery.
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