HYTOS

        public Group Group { get; set; }

        public PSNItem PSNItem { get; set; }

        public LineNumber LineNumber { get; set; }

        public Equipment Equipment { get; set; }

        public Document Document { get; set; }

        public string Keyword { get; set; }

    }

    public class Relation 

        public List<Attribute> Attributes { get; set; }

        public bool IsCopy { get; set; }

        public LineNumber Copy()

        {

            LineNumber copy = new LineNumber();