[C#] XML SiteMapReader

Sitemap.xml

<?xml version="1.0" encoding="utf-8" ?>
<XmlSiteMap>
  <Menu id="home" controller="Home" action="index" title="Mijn Homepage" url="http://mijnhomepage.nl" />
  <Menu id="producten" controller="Products" action="overview" title="Mijn Producten" url="http://mijnhomepage/producten/" />
</XmlSiteMap>

XmlSitemapReader.cs

    /// <summary>
    /// Simple proof-of-concept demo for reading a Sitemap.xml file.
    /// </summary>
    public class SitemapReader : IDisposable
    {
        private string Filename { get; set; }

        public List<SitemapItem> Nodes { get; private set; }

        public SitemapReader(string filename)
        {
            this.Nodes = new List<SitemapItem>();
            this.Filename = filename;
            
            Initialize();
        }

        private void Initialize()
        {
            XDocument document = null;
            using (var stream = new StreamReader(Filename))
            {
                document = XDocument.Load(stream);
            }

            var root = document.Element("XmlSiteMap").Elements("Menu");

            foreach (var element in root)
            {
                // Parse the <Menu>-item into the 
                if (element.HasAttributes)
                {
                    // TODO: Element attribute ID should be case-insensitve
                    var node = new SitemapItem() {
                        Id = element.Attribute("id").Value ?? string.Empty,
                        Title = element.Attribute("title").Value ?? string.Empty,
                        Action = element.Attribute("action").Value ?? string.Empty ,
                        Controller = element.Attribute("controller").Value ?? string.Empty ,
                        ExternalUrl = element.Attribute("url").Value ?? string.Empty
                    };

                    Nodes.Add(node);
                }

            }

        }



        public void Dispose()
        {
            this.Nodes.Clear();
        }
    }

    public class SitemapItem
    {
        public string Id { get; set; }
        public string Title { get; set; }
        public string Controller { get; set; }
        public string Action { get; set; }
        public string ExternalUrl { get; set; }

    }