Class PropertyTable

Add property set

Associate property set with entity

Find entities with property matching value

Get all properties for entity, one entry per distinct pset NAME.

An entity can carry two same-named property sets (two IfcRelDefinesByProperties pointing at distinct IfcPropertySets — the same shape getProperty, above, scans through). Keying the result Map by name alone would let the later same-named set overwrite the earlier one, silently dropping every property that lived only in the set that got overwritten. Merge same-named sets' properties instead — earlier-set values win on a key collision, matching getProperty's own first-match-wins order above.

Get property value for entity. An entity can carry two same-named property sets (two IfcRelDefinesByProperties pointing at distinct IfcPropertySets, same as findEntities below handles) — keep scanning subsequent same-named sets when an earlier one doesn't have the property, rather than returning null on the first name match.