TIdMessageEncoderXXE is a TIdMessageEncoderUUEBase descendant that implements support for creating XXEncoded message parts. TIdMessageEncoderXXE extends the ancestor class by overriding the constructor to assign an instance of TIdEncoderXXE to the EncoderClass property for the object instance.
Create is the Constructor for the object instance, and relies on the inherited Create method. Create assigns an instance of TIdEncoderXXE, used to perform encoding of body lines in the XXEncoded packet, to the EncoderClass property.