IFC entities are case sensitive or not?

IFCplusplus also open ifc files with camel case i had verified it , but as per @Moult it is not certified so leave it.
Bentley biggest BIM software is AESOsim , i know it good software and working well , but if my ifc is in camel case it open it .
it open both upper and camel case files with same output so as per these review i can say it is not obeying case senstivity of ifc and ISO and this software is certified by building smart @TLiebich
i can send you camel case ifc file and you can test it

So finally the outcome is same that IFC is case sensitive and its keywords are upper case.
Correct and good ifc is that which had keyword as case sensitive and good software is that which take ifc as case sensitivity but many software’s are not following it , take examples of software i listed above and still i am working and will tell you many more problems of it.