I noticed that some properties have been changed names from version 18.104.22.168 to 4.3.2 (e.g. Color becomes Colour). For those who have to develop software this becomes a problem if we have to maintain both versions.
There were two properties in IFC4: color and colour. In 4.3 the property names have been normalised. There is only one now (colour).
Ok, the problem that other properties were also renamed, just some examples in Pset_ConcreteElementGeneral and