[XmlElementAttribute("Decimal", typeof(decimal))]
[XmlElementAttribute("Keywords", typeof(DocumentIndexFieldKeywords))]
[XmlElementAttribute("DateTime", typeof(DateTime))]
[XmlElementAttribute("Int", typeof(int))]
[XmlElementAttribute("String", typeof(string))]
[XmlElementAttribute("Date", typeof(DateTime), DataType = "date")]
[XmlElementAttribute("Memo", typeof(string))]
[XmlChoiceIdentifierAttribute("ItemElementName")]
public Object Item { get; set; }