I said each XAML element represents a .NET CLR class.  Most XAML elements are inherited from System.Windows.UIElement, System.Windows.FrameworkElement, System.Windows.FrameworkContentElement and System.Windows.ContentElement.  There are not any XAML elements that correspond to abstract classes in .NET CLR, but there are tons of XAML elements that are corresponded to classes that are inherited from these abstract classes.

We have four general kinds of XAML elements.

·         Root elements: Windows and Page elements are the most common root elements that you will use.  These elements sit as the root element for your XAML files and contain other elements.

·         Panel elements: These elements help you to lay out your user interface.  Common panel elements are StackPanel, DockPanel, Grid and Canvas.

·         Control elements: These elements define several types of controls in XAML and let you put a control on your UI and customize it.

·         Geometric elements: This kind of elements helps you to draw shapes and geometric graphics on your UI.  There are many Geometric elements such as LineGeometry, EllipseGeometry, PathGeometry and LineSegment.

·         Document elements: These elements are helpful when you want to deal with presentation of a document.  Inline and Block elements are two major groups of these elements that help out to make your desired look for a document.  Some famous Inline elements are Bold, LineBreak and Italic and some famous Block elements are Paragraph, List, Block, Figure and Table.  Compare these elements with some HTML elements such as <p>, <table> and <i>.