internal IfcDerivedUnitElement(DatabaseIfc db, IfcDerivedUnitElement e) : base(db) { Unit = db.Factory.Duplicate(e.Unit) as IfcNamedUnit; mExponent = e.mExponent; } public IfcDerivedUnitElement(IfcNamedUnit u, int exponent) : base(u.mDatabase) { mUnit = u.mIndex; mExponent = exponent; }