public async Task LoadXml() {

			if (IsLoaded)
				return;

			IFolder rootfolder = FileSystem.Current.LocalStorage;
			Debug.WriteLine (rootfolder.Path);
			IFile file = await rootfolder.GetFileAsync ("roget15aHierarchy.xml");
			using (TextReader reader = new StreamReader(await file.OpenAsync(FileAccess.Read)))
			{
				XmlSerializer serializer = new XmlSerializer(typeof(RogetHierarchy));
				hierarchy = (RogetHierarchy)serializer.Deserialize(reader);
				// HACK: makes Divisions synonymous with Sections, makes navigation easier
				foreach (var h in hierarchy.Classes)
				{
					foreach (RogetDivision d in h.Divisions)
					{
						h.Sections.Add(new RogetSection{Name=d.Name, Sections = d.Sections});
					}
				}
			} 
			Classes = hierarchy.Classes;

			file = await rootfolder.GetFileAsync ("roget15aCategories.xml");
			using (TextReader reader = new StreamReader(await file.OpenAsync(FileAccess.Read)))
			{
				XmlSerializer serializer = new XmlSerializer(typeof(RogetCategories));
				Categories = (RogetCategories)serializer.Deserialize(reader);
			}
			IsLoaded = true;
			return;
		}
        public async Task LoadXml()
        {
            if (IsLoaded)
            {
                return;
            }

            IFolder rootfolder = FileSystem.Current.LocalStorage;

            Debug.WriteLine(rootfolder.Path);
            IFile file = await rootfolder.GetFileAsync("roget15aHierarchy.xml");

            using (TextReader reader = new StreamReader(await file.OpenAsync(FileAccess.Read)))
            {
                XmlSerializer serializer = new XmlSerializer(typeof(RogetHierarchy));
                hierarchy = (RogetHierarchy)serializer.Deserialize(reader);
                // HACK: makes Divisions synonymous with Sections, makes navigation easier
                foreach (var h in hierarchy.Classes)
                {
                    foreach (RogetDivision d in h.Divisions)
                    {
                        h.Sections.Add(new RogetSection {
                            Name = d.Name, Sections = d.Sections
                        });
                    }
                }
            }
            Classes = hierarchy.Classes;

            file = await rootfolder.GetFileAsync("roget15aCategories.xml");

            using (TextReader reader = new StreamReader(await file.OpenAsync(FileAccess.Read)))
            {
                XmlSerializer serializer = new XmlSerializer(typeof(RogetCategories));
                Categories = (RogetCategories)serializer.Deserialize(reader);
            }
            IsLoaded = true;
            return;
        }