/// <summary>
    This class holds the filter options applied to a specific navigation item.
    /// </summary>       
    public class FilterOptions

    {
       /// <summary>
       /// Gets or sets option Levels of Search.
       /// Provides the levels of search performed on the hierarchy of a navigation path.
       /// </summary>
       public LevelsOfSearch LevelsOfSearch { get; set; }

       /// <summary>
       /// Gets or sets the option NavigationSearchMode.
       /// Provides the navigation search mode for the given navigation path.
       /// </summary>
       public NavigationSearchMode NavigationSearchMode { get; set; }

       /// <summary>
       /// Gets or sets SortOrder option.
       /// SortOrder controls how items are sorted after they are returned to you
       public SortOrder SortOrder { get; set; }

       /// <summary>
       /// Gets or sets option ContentType
       /// 1) This field should be one of the content types in the system
       /// 2) This field is ignored if the value is empty.
       /// </summary>
       public IEnumerable<string> ContentType { get; set; }
    }

    // This example gets content with the ContentType of "faceplate."
    searchResult = navModel.GetContentInHierarchy(@"\\Home\Root1", new FilterOptions() { ContentName = "*",
       ContentTypes = new string [] { "faceplate" }, LevelsOfSearch = LevelsOfSearch.SearchesOneLevel,
       NavigationSearchMode = NavigationSearchMode.ChildrenAlone });

    // This example gets content with the ContentType of "faceplate" or "overview."
    searchResult = navModel.GetContentInHierarchy(@"\\Home\Root1", new FilterOptions() { ContentName = "*",
       ContentTypes = new string[] { "faceplate", "Overview" }, LevelsOfSearch = LevelsOfSearch.SearchesOneLevel,
       NavigationSearchMode = NavigationSearchMode.ChildrenAlone });

    // This example ignores ContentTypes.
    searchResult = navModel.GetContentInHierarchy(@"\\Home\Root1", new FilterOptions() { ContentName = "*",
       ContentTypes = null, LevelsOfSearch = LevelsOfSearch.SearchesOneLevel,
       NavigationSearchMode = NavigationSearchMode.ChildrenAlone });

    // This example ignores ContentTypes while searching child nodes.
    searchResult = navModel.GetContentInHierarchy(@"\\Home\Root1", new FilterOptions()
       { ContentName = "*", LevelsOfSearch = LevelsOfSearch.SearchesOneLevel,
       NavigationSearchMode = NavigationSearchMode.ChildrenAlone });

    // This example searches for any ContentType.
    searchResult = navModel.GetContentInHierarchy(@"\\Home\Root1", new FilterOptions()
       { ContentName = "*", ContentTypes = new string[] { "Any" }, LevelsOfSearch = LevelsOfSearch.SearchesOneLevel,
       NavigationSearchMode = NavigationSearchMode.ChildrenAlone });

    // This example searches content with no ContentType.
    searchResult = navModel.GetContentInHierarchy(@"\\Home\Root1", new FilterOptions()
       { ContentName = "*", ContentTypes = new string[] { }, LevelsOfSearch = LevelsOfSearch.SearchesOneLevel,
       NavigationSearchMode = NavigationSearchMode.ChildrenAlone });

    /// <summary>
    /// This option controls how content searches are sorted from the API
    /// </summary>
    public enum SortOrder
    {
        /// <summary>
       /// This is the default option, which fills the control based on the order in which it finds the content.
       /// This is similar to depth-first search
       /// </summary>
       None = 0,

       /// <summary>
       /// Sorts content based on name in ascending (A-Z) alphabetic order.
       /// </summary>
       Alphabetical
   }

    /// <summary>
    /// This option provides the different navigation search modes that system allows .
    /// </summary>
    public enum NavigationSearchMode
    {
       /// <summary>
       /// In FixedLocation mode, a search starts from a specific navigation path node provided by the user.
       /// </summary>
       FixedLocation = 0,
        /// <summary>
       /// In CurrentPath mode, a search starts from the current navigation path node selected by the user.
       /// This is same path as MyViewApp.Navigation.CurrentPath
       /// </summary>
       CurrentNav CurrentPath,
        /// <summary>
       /// In ChildrenAlone mode, a search starts from the child navigation nodes of a parent.
       /// Node specified by the user.
       /// </summary>
       ChildrenAlone
    }

    /// <summary>
    /// This option provides the different levels of search that the system allows.
    /// </summary>
    public enum LevelsOfSearch
    {
       /// <summary>
       /// Searches all levels of a navigation hierarchy.
       /// </summary>
       All = 0,

       /// <summary>
       /// Searches only one level of a navigation hierarchy.
       /// </summary>
       SearchesOneLevel,

       /// <summary>
       /// Searches two levels of a navigation hierarchy
       /// </summary>
       SearchesTwoLevels,

       /// <summary>
       /// Searches three levels of a navigation hierarchy
       /// </summary>
       SearchesThreeLevels
   }

    /// <summary>
    /// This class holds content information, such as name and owning object.     /// </summary>
    public class ContentData
    {

       /// <summary>
       /// Gets the name of the content.
       /// </summary>
       public string ContentName { get; }

       /// <summary>
       /// Gets the owning object of the content.
       /// </summary>
       public string OwningObject { get; }
   }