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Here we use the types PointF and RectangleF from the System.Drawing namespace, though we could equally define our own types to capture the information carried by the leaves of the tree. Listing 9-1 shows a recursive transformation to convert XML documents like the one used in the previous section into the type Scene. Listing 9-1. Converting XML into a Typed Format Using the System.Xml Namespace open System.Xml open System.Drawing type Scene = | Ellipse of RectangleF | Rect of RectangleF | Composite of Scene list /// A derived constructor static member Circle(center:PointF,radius) = Ellipse(RectangleF(center.X-radius,center.Y-radius, radius*2.0f,radius*2.0f)) /// A derived constructor static member Square(left,top,side) = Rect(RectangleF(left,top,side,side)) let extractFloat32 attrName (attribs: XmlAttributeCollection) = Float32.of_string(attribs.GetNamedItem(attrName).Value) let extractPointF (attribs: XmlAttributeCollection) = PointF(extractFloat32 "x" attribs,extractFloat32 "y" attribs) let extractRectangleF (attribs: XmlAttributeCollection) = RectangleF(extractFloat32 "left" attribs,extractFloat32 "top" attribs, extractFloat32 "width" attribs,extractFloat32 "height" attribs) let rec extractScene (node: XmlNode) = let attribs = node.Attributes let childNodes = node.ChildNodes match node.Name with | "Circle" -> Scene.Circle(extractPointF(attribs), extractFloat32 "radius" attribs) | "Ellipse" -> Scene.Ellipse(extractRectangleF(attribs)) | "Rectangle" -> Scene.Rect(extractRectangleF(attribs)) | "Square" -> Scene.Square(extractFloat32 "left" attribs,extractFloat32 "top" attribs, extractFloat32 "side" attribs)

You can use the Tab key on your keyboard to move from link to link Pressing the Return key will activate the currently selected link There is an event handler specifically for the action of pressing any key on the keyboard It is called onkeypress If I want to execute the same behavior for onkeypress as onclick, I could simply duplicate the instructions: links[i]onclick = function() { return showPic(this) false : true; } links[i]onkeypress = function() { return showPic(this) false : true; } There s an easier way to ensure that onkeypress imitates onclick, however: links[i]onkeypress = links[i]onclick; This assigns all the functionality from the onclick event to the onkeypress event as well: links[i]onclick = function() { return showPic(this) false : true; } links[i]onkeypress = links[i]onclick; That brings us right back to the benefits of unobtrusive JavaScript.

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s Note The types of presentation technologies continue to multiply, and each comes with a new and relatively incompatible technology with which we must work. It s virtually impossible to create a programming framework that entirely abstracts presentation concepts. Because of this, the architecture and framework will merely support the creation of varied presentations, not automate their creation. Instead, the focus will be on simplifying the other tiers in the architecture, for which technology is more stable.

| "Composite" -> Scene.Composite [ for child in childNodes -> extractScene(child) ] | _ -> failwithf "unable to convert XML '%s'" node.OuterXml let extractScenes (doc: XmlDocument) = [ for node in doc.ChildNodes do if node.Name = "Scene" then yield (Composite [ for child in node.ChildNodes -> extractScene(child) ]) ] The inferred types of these functions are as follows: type Scene = | Ellipse of RectangleF | Rect of RectangleF | Composite of Scene list static member Circle : PointF * float32 -> Scene static member Square : float32 * float32 * float32 -> Scene val val val val val extractFloat32 : string -> XmlAttributeCollection -> float32 extractPointF : XmlAttributeCollection -> PointF extractRectangleF : XmlAttributeCollection -> RectangleF extractScene : XmlNode -> Scene extractScenes : XmlDocument -> Scene list

Now that I ve addressed the distinction between presentation and UI, the latter s purpose is probably fairly clear. This layer includes the logic to decide what the user sees, the navigation paths, and how to interpret user input. In a Windows Forms application, this is the code behind the form. Actually, it s the code behind the form in a Web Forms application, too, but here it can also include code that resides in server-side controls; logically, that s part of the same layer.

The definition of extractScenes in Listing 9-1 generates lists using sequence expressions, covered in 3. We can now apply the extractScenes function to our original XML. (We first add a pretty-printer to the F# Interactive session for the RectangleF type using the AddPrinter function on the fsi object, described in 10.) > fsi.AddPrinter(fun (r:RectangleF) -> sprintf "[%A,%A,%A,%A]" r.Left r.Top r.Width r.Height);; val it : unit = () > extractScenes doc;; val it : Scene list = [Composite [Composite [Ellipse [-1.0f,-2.0f,4.0f,4.0f]; Composite [Ellipse [2.0f,-2.0f,4.0f,4.0f]; Rect [-3.0f,0.0f,2.0f,2.0f]]; Ellipse [-2.0f,2.0f,3.0f,4.0f]]]] We more closely explain some of the choices we ve made in the abstract syntax design for the type Scene in the following sections.

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