private Relation ToRelation(Rel rel)
        {
            Relation relation = new Relation(rel.Name, null, EnabledFlag.False);

            foreach (var col in rel.Columns)
            {
                relation.RelationColumns.Add(new RelationColumn(col));
            }
            foreach (var relRow in rel.Rows)
            {
                relation.AddRelationRow(relRow.Value.ToArray());
            }
            return(relation);
        }