Editing in Authentic View
This section describes important features of Authentic View in detail. Features have been included in this section either because they are frequently used or because the mechanisms or concepts involved require explanation.
The section explains the following:
•The Date Picker is a graphical calendar that enters dates in the correct XML format when you click a date. See Date Picker.
•An entity is shorthand for a special character or text string. You can define your own entities, which allows you to insert these special characters or text strings by inserting the corresponding entities. See Defining Entities for details.
•In the Enterprise and Professional editions of Altova products, Authentic View users can sign XML documents with digital XML signatures and verify these signatures.
•What image formats can be displayed in Authentic View.
To learn how to use all the features of Authentic View, please do the Authentic View Tutorial using either XMLSpy or Authentic Desktop. The Authentic View Tutorial is available with these products.
Altova website: 
XML content editing, XML authoring