As far as I know, this is the case (pun intended), yes

Hi @sidhucivil5932,

Thanks for your question! I believe it is case sensitive, and the general rule seems to be camel casing, where the first letter of the word is capitalized like IfcProduct. I ran a quick test changing the casing writing out to IFC and the geometry disappears. The same output with differing casing doesn't read properly in an IFC viewer like DDS-CAD either. Here's some links to check out to read more on it:

• BuildingSmart list of entities for IFC 2x3
• COBie Quality Control excerpt from a search
• and it might be worth checking out the specification/standards from BuildingSMART
• also check out Writing IFC Objects from our IFC reader doc

Thank you @jovitaatsafe for your help.

I will definatly go through these links.

Thank you @sander.

Greetings for the day,

When we create or export IFC file all the entities are in "uppercase" format.

I used IFCOPENSHELL and PYTHON to extract some of the entities from the IFC file and I got the resulting IFC file after extraction having entities in "camelcase" which is before extraction in "caps case". Why?

Also, IFC file having entities in camelcase (which I got after extraction) is not opening in viewers like SOLIBRI MODEL VIEWER and DDS-CAD.

Please help me to understand these.

Thank you.

I checked in with a colleague, and my apologies for the confusion. In your workspace in FME Workbench, it should be camelcase, but in the IFC file itself, the feature types are all uppercase.

There's a bit more information on casing from this forum here on IFC.