protected override string BuildStringSTEP()
{
if (mPlacesObject.Count == 0 && mReferencedByPlacements.Count == 0)
return "";
return base.BuildStringSTEP() + "," + ParserSTEP.LinkToString(mPlacementRelTo) + "," + ParserSTEP.LinkToString(mRelativePlacement == 0 ? mDatabase.Factory.PlaneXYPlacement.mIndex : mRelativePlacement);
}