Dealing with dodgy IFC properties.

Anyone got any clever ideas on how I can remove a Property from a Pset. The catch is that the Property exists twice in the PropertySet, once with the correct Value, once with the string "Error".

So far my attempt with ifcopenshell has stalled as I can't seem to pull Properties from a Pset if they exist twice, IOS just gives me one of the two.


import ifcopenshell

import ifcopenshell.util.element

from pathlib import Path

from pprint import pprint


ifc_path = r"./mdl/"

ifc_glob = Path(ifc_path).glob("*.ifc")


guid_fpid_dict = {}


for ifc_file in ifc_glob:


    mdl = ifcopenshell.open(ifc_file)

    objs = mdl.by_type("IfcBuildingElementProxy")


    for obj in objs:


        guid = obj.GlobalId        

        fpid = ifcopenshell.util.element.get_pset(obj, name="MyPset")



        guid_fpid_dict[guid] = fpid


pprint(guid_fpid_dict["ExampleGlobalID"])

The resulting dict only contains one instance of the Property, rather than the two I know it has. I assume this is because the IFC is so dodgy that IOS wasn't built to expect it.

I would love to fix at source instead but that is just as much of a struggle.