Express ids of other IfcRel* instances that named the same
(source, target, type) triple and were collapsed into this edge by the
dedupe in RelationshipGraphBuilder.addEdge (#3760). A consumer that
needs to know whether the connection still exists after a delete —
not just whether relationshipId was deleted — must check these too:
use edgeSurvives (relationship-graph-helpers.js) rather than
testing relationshipId alone. Invariant: present implies non-empty —
undefined means "nothing collapsed into this edge", never [].
Express ids of other
IfcRel*instances that named the same (source, target, type) triple and were collapsed into this edge by the dedupe inRelationshipGraphBuilder.addEdge(#3760). A consumer that needs to know whether the connection still exists after a delete — not just whetherrelationshipIdwas deleted — must check these too: useedgeSurvives(relationship-graph-helpers.js) rather than testingrelationshipIdalone. Invariant: present implies non-empty —undefinedmeans "nothing collapsed into this edge", never[].