This call can be used to check if an attribute is defined schema wise in the context of a certain entity


public const string ifcenginedll = @"ifcengine.dll";

[DllImport(IFCEngineDLL, EntryPoint = "engiGetAttrDerived")]
public static extern Int32 engiGetAttrDerived(int_t entity, int_t attribute);    

Property entity

Size: 32 bit / 4 byte (value)

Property attribute

Size: 32 bit / 4 byte (reference)