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 Int64 engiGetAttrDerived(int_t entity, int_t attribute);    

Property entity

Size: 64 bit / 8 byte (value)

Property attribute

Size: 64 bit / 8 byte (reference)