ISharedListRepository repository = new MemoryListRepository();
this.Repositories.Add(repository);

XmlReader rssReader = XmlReader.Create("http://www.spiegel.de/schlagzeilen/tops/index.rss");
Rss20FeedFormatter feed = new Rss20FeedFormatter();
if (feed.CanRead(rssReader))
{
    feed.ReadFrom(rssReader);
    rssReader.Close();
}

SharedCalendar calendar = new SharedCalendar
{
    Id = new Guid("AC0D3D64-FAAE-4ec2-BA6A-D4C31E141EAF"),
    Name = "Spiegel-Online"
};

int id = 0;
foreach (SyndicationItem item in feed.Feed.Items)
{
    SharedAppointment appointment = new SharedAppointment
    {
        Id = ++id, 
        Title = item.Title.Text,
        Description = item.Summary.Text,
        EventDate = item.PublishDate.LocalDateTime,
        Categories = { "Schlagzeilen", "Nachrichten" },
        CreationDate = item.PublishDate.LocalDateTime,
        ModifiedDate = item.PublishDate.LocalDateTime
    };

    calendar.Items.Add(appointment);
}

repository.AddList(calendar);