OptionaldeferredOptionaldropOptionalgeoreferencingImmutable pre-extracted georeferencing for stores without STEP resource rows.
OptionallengthProject length-unit scale to SI metres, avoiding repeat unit-graph parsing.
OptionallengthWhether lengthUnitScale was declared by the first IFCPROJECT or is the assumed metre (#7395); absent when not parsed from STEP here.
OptionalonOn-demand classification lookup: entityId -> array of IfcClassificationReference expressIds Built from IfcRelAssociatesClassification relationships during parsing.
OptionalonOn-demand document lookup: entityId -> array of IfcDocumentReference/IfcDocumentInformation expressIds Built from IfcRelAssociatesDocument relationships during parsing.
OptionalonOn-demand material lookup: entityId -> associated material definition expressIds. Built from IfcRelAssociatesMaterial relationships during parsing. Each value is the expressId of IfcMaterial, IfcMaterialLayerSet, IfcMaterialProfileSet, IfcMaterialConstituentSet, IfcMaterialList, or a *Usage. The value is a LIST so a second IfcRelAssociatesMaterial targeting the same element (valid in the wild) is preserved rather than last-wins overwritten — the model-wide usage index depends on seeing every one.
OptionalonOn-demand property lookup: entityId -> array of property set expressIds Used for fast single-entity property access without pre-building property tables. Use extractPropertiesOnDemand() with this map for instant property retrieval.
OptionalonOn-demand quantity lookup: entityId -> array of quantity set expressIds Used for fast single-entity quantity access without pre-building quantity tables. Use extractQuantitiesOnDemand() with this map for instant quantity retrieval.
OptionalresolvedPre-resolved classification attrs, server-parsed path only — #3955.
OptionalresolvedThe IFC source bytes, behind an accessor rather than a resident
Uint8Array (#2183). Read ranges with slice/decodeUtf8; use
withMaterialized for the genuine whole-file consumers, and
toTransferable() to hand it to a worker without materialising here.
byteLength === 0 is a supported state (server-parsed, synthetic, GLB,
point-cloud), and length is aliased so existing presence guards keep
their meaning.
OptionalsourceVerbatim HEADER fields from the source file, when this store was built by
parsing a STEP/IFC file. Absent for created-from-scratch models. Lets a
round-trip export preserve the original FILE_DESCRIPTION items and the
exact FILE_SCHEMA token (e.g. IFC4X3_ADD2).
OptionalspatialOptionalspatial
Semantic drop census (#4208): per-class scanned/retained counts, the classes the categoriser skipped, classes unknown to the schema registry, and IFCREL* classes seen but not indexed as relationship edges. Always present after a parse — its absence (not a zero count) is what means "the census did not run".