public static XElement ToXElement(Library library)
{
Validator.IsNotNull(library, "library");
var attributes = new XObject[]
{
new XAttribute("v", library.Version),
new XAttribute("st", library.SourceType)
};
IEnumerable<XObject> items = library.Items.Select(item => ToXElement(item)).Cast<XObject>();
IEnumerable<XObject> objects = attributes.Concat(items);
return new XElement("l", objects);
}