public String ToXml(String tab){StringBuilder builder = new StringBuilder();builder.Append(tab).Append("<").Append(RecordName).Append(">\n");for (IEnumerator iterator = EscherRecords.GetEnumerator(); iterator.MoveNext(); ){EscherRecord escherRecord = (EscherRecord)iterator.Current;builder.Append(escherRecord.ToXml(tab + "\t"));}builder.Append(tab).Append("</").Append(RecordName).Append(">\n");return builder.ToString();}