Deleting / Removing stuff from the xbim model about xbimessentials HOT 8 CLOSED

_Model.CreateFrom(ifcFilename, xbimDbFilename, null, true, true);
var outputModel = new XbimModel();

using (var transaction = outputModel.BeginTransaction("add to representation"))
{
    outputModel.InsertCopy(_Model.IfcProject, transaction);
    outputModel.Validate(transaction.Modified(), Console.Out);
    transaction.Commit();
}

        var model = new XbimModel();
        var modelCopy = new XbimModel();
        try
        {
            _temporaryXbimFileName = Path.GetTempFileName();
            SetOpenedModelFileName(ifcFilename);             

            if (worker != null)
            {
                model.CreateFrom(ifcFilename, _temporaryXbimFileName, worker.ReportProgress, true);
                string tempFileName = "";
                modelCopy = XbimModel.CreateModel(tempFileName);

                modelCopy.AutoAddOwnerHistory = false;
                using (var txn = modelCopy.BeginTransaction())
                {
                    var copied = new XbimInstanceHandleMap(model, modelCopy);
                    //modelCopy.InsertCopy(model.IfcProject, txn);
                    foreach (var item in model.Instances)
                    {
                        var ifctype = item.IfcType();
                        if (ifctype.IfcTypeEnum == IfcEntityNameEnum.IFCPROJECT || 
                            ifctype.IfcTypeEnum == IfcEntityNameEnum.IFCBUILDING ||
                            ifctype.IfcTypeEnum == IfcEntityNameEnum.IFCBUILDINGSTOREY ||
                            ifctype.IfcTypeEnum == IfcEntityNameEnum.IFCSITE ||
                            ifctype.IfcTypeEnum == IfcEntityNameEnum.IFCWALLSTANDARDCASE )
                        {
                            modelCopy.InsertCopy(item, copied, txn, false);
                        }                        
                    }

                    txn.Commit();
                }

                var context = new Xbim3DModelContext(modelCopy);//upgrade to new geometry represenation, uses the default 3D model
                context.CreateContext(geomStorageType: XbimGeometryType.PolyhedronBinary,  progDelegate: worker.ReportProgress,  adjustWCS: false);

                if (worker.CancellationPending) //if a cancellation has been requested then don't open the resulting file
                {
                    try
                    {
                        model.Close();
                        if (File.Exists(_temporaryXbimFileName))
                            File.Delete(_temporaryXbimFileName); //tidy up;
                        _temporaryXbimFileName = null;
                        SetOpenedModelFileName(null);
                    }
                    catch (Exception ex)
                    {
                        Log.Error(ex.Message, ex);
                    }
                    return;
                }
            }
            args.Result = modelCopy;

        }
        catch (Exception ex)
        {
            var sb = new StringBuilder();
            sb.AppendLine("Error reading " + ifcFilename);
            var indent = "\t";
            while (ex != null)
            {
                sb.AppendLine(indent + ex.Message);
                ex = ex.InnerException;
                indent += "\t";
            }

            args.Result = new Exception(sb.ToString());
        }
    }