Where is IFC guid stored?

[eibre]

Is the IFC-GUID stored in Revit unless you check the following checkbox?

Is the GUID expected to be stable in the future exports of the same element if it's not strored as a parameter in Revit?

[AngelVelezSosa]

The GUID is expected to be stable, but this checkbox future-proofs against any necessary (or unexpected) changes based on a newer version of the IFC. It isn't necessary, which is why it is in the Advanced tab.

[eibre]

Thanks! Is it possible to figure out the Revit element that correspond to a certain guid if the option was not checked during export? Is there a mapping saved somewhere else or is the IFC guid based on revits unique id somwhow? We want to parse a bcf file and get the elements in Revit based the IFC guids stored in the file.

[AngelVelezSosa]

The general way to generate the GUID is to use a base GUID and XOR with the element id. But not sure you have access to that GUID in BCF. The element id isn't in the tag in BCF?

[eibre]

I guess we can look up the element id in the IFC file by the GUID from BCF. Thanks for the info Angel!

[klacol]

Please be aware of changing GUID's when changing the phase, see #65.