OptionalanyNo relation in the XML: any part-of relation counts, recursively (IDS 1.0, #7401); relation then holds the containment default.
OptionalentityOptional entity constraint for the related parent
OptionalfacetsIDS 1.1 PREVIEW (#379, draft PR #380): further facets the related parent must satisfy.
OptionalinstructionsIDS 1.1 PREVIEW. Only set by parseIDS(xml, { preview: { ids11: true } }).
OptionalrawThe XML relation string when it is not a recognised PartOfRelation; the auditor flags it.
Relationship type (normalised; defaults to IfcRelContainedInSpatialStructure when unrecognised).
PartOf facet - match by spatial/compositional relationship