private static void WriteContacts(XmlWriter writer, List<Contact> contacts)
{
if (contacts == null || contacts.Count == 0)
return;
writer.WriteXmlAttribute("J", GetContactForType(contacts, ContactTypeEnum.FixedPhone));
writer.WriteXmlAttribute("K", GetContactForType(contacts, ContactTypeEnum.MobilePhone));
writer.WriteXmlAttribute("L", GetContactForType(contacts, ContactTypeEnum.Fax));
writer.WriteXmlAttribute("M", GetContactForType(contacts, ContactTypeEnum.Email));
}