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If the element itself has not yet been rendered, call the default theme function for the #type of this element. For example, if this element is a text field in a form (i.e., the #type property has been set to textfield in the form definition), the default theme function will be theme_textfield(). If the #type of this element has not been set, default to markup. Default theme functions for core elements such as text fields are found in includes/form.inc. If content was generated for this element and one or more function names are found in the #post_render property, call each of them, and pass the content and the element. The #post_render function(s) must return the final content. Prepend #prefix and append #suffix to the content, and return it from the function.

Figure 27-13. Kaxaml is a very helpful (and free) tool used to learn the grammar of XAML As you work with kaxaml, remember that this tool does not allow you to author any markup that entails code compilation (however, using x:Name is allowed). This includes defining a x:Class attribute (for specifying a code file), entering event handler names in markup, or using any XAML keywords that also entail code compilation (such as FieldModifier or ClassModifier). Any attempt to do so will result in a markup error.

XAML XML Namespaces and XAML "Keywords"

The effect of this recursive iteration is that HTML is generated for every level of the form tree. For example, in a form with a fieldset with two fields, the #children element of the fieldset will contain HTML for the fields inside it, and the #children element of the form will contain all of the HTML for the form (including the fieldset s HTML). This generated array, ready to be rendered, is then returned to the caller of drupal_get_form(). That s all it takes! We ve reached the Return HTML endpoint in Figure 11-1.

The root element of a WPF XAML document (such as a <Window>, <Page>, <UserControl> or <Application> definition) will almost always make reference to two predefined XML namespaces: <Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <Grid> </Grid> </Page> The first XML namespace, http://schemas.microsoft.com/winfx/2006/xaml/presentation, maps a slew of WPF .NET namespaces for use by the current *.xaml file (System.Windows,

System.Windows.Controls, System.Windows.Data, System.Windows.Ink, System.Windows.Media, System.Windows.Navigation, etc.). This one-to-many mapping is actually hard-coded within the WPF assemblies (WindowsBase.dll, PresentationCore.dll, and PresentationFramework.dll) using the assembly-level [XmlnsDefinition] attribute. Here is one such listing, which essentially imports System.Windows: [assembly: XmlnsDefinition("http://schemas.microsoft.com/winfx/2006/xaml/presentation", "System.Windows")] If you load these WPF assemblies into reflector.exe, you can view these mappings firsthand. For example, if you select the PresentationCore.dll assembly (see Figure 27-14), and press the Space key, you will see numerous instances of the [XmlnsDefinition] attribute.

Now let s go back in Figure 11-1, to the place where we branched off in the section Checking If the Form Has Been Submitted. Let s assume that the form has been submitted and contains some data; we ll take the other branch and look at that case. Drupal s form processing engine determines whether a form has been submitted based on $_POST being nonempty and the presence of a string value in $_POST['form_id'] that matches the ID of the form definition that was just built (see the Setting an ID section). When a match is found, Drupal validates the form. The purpose of validation is to check that the values that are being submitted are reasonable. Validation will either pass or fail. If validation fails at any point, the form will be redisplayed with the validation errors shown to the user. If all validation passes, Drupal will move on to the actual processing of the submitted values.