A LIST, SET, BAG or ARRAY.
The entity that declares the attribute, e.g. IfcRoot.
Derived for this entity: written *, refused by setAttributeByName.
Its slot: the index of attribute and setAttribute.
The declared name in the schema's spelling, e.g. GlobalId.
{ kind: "null" } is a valid value.
The declared type, or an aggregate's element type.
One explicit attribute of an entity, from
IfcModel.attributeNames.