public XElement ToXML()
{
var xPublishInfo = new XElement(Fb2Const.fb2DefaultNamespace + PublishInfoElementName);
if (BookTitle != null)
{
xPublishInfo.Add(BookTitle.ToXML(BookNameElementName));
}
if (Publisher != null)
{
xPublishInfo.Add(Publisher.ToXML(PublisherElementName));
}
if (City != null)
{
xPublishInfo.Add(City.ToXML(CityElementName));
}
if (Year != null)
{
xPublishInfo.Add(new XElement(Fb2Const.fb2DefaultNamespace + YearElementName, Year.ToString()));
}
if (ISBN != null)
{
xPublishInfo.Add(ISBN.ToXML(ISBNElementName));
}
foreach (SequenceType sec in ItemSequences)
{
xPublishInfo.Add(sec.ToXML());
}
return xPublishInfo;
}