NextGen-IFC
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Allow IfcRelVoidsElement to be a one to many relationship.
Allow IfcRelVoidsElement to be a one to many relationship.
discussed here.
Would allow for things like the following. That is, 'clipping' multiple walls with one IfcOpeningElement

support the request - this is also an old request from the IFC4 Design-Transfer-View requirements to allow the definition of e.g. vertical shafts - a void, that penetrates multiple building elements (like slabs and coverings).
related: https://github.com/buildingSMART/IFC4.3.x-development/issues/463