//===========================================================================//=-------------------------------------------------------------------------=//= Module history:                                                         =//= - December 8 2006 - Oscar Chavarro: Original base version               =//===========================================================================package vsdk.toolkit.gui;/**DEFINITION: A `PresentationElement` in VitralSDK is a software element withalgorithms and data structures (i.e. a class) with the specific functionalityof managing (create, delete, query and modify) a data Entity from humanuser interaction. Usually, a `PresentationElement` provides specifichuman-machine interaction techniques to applications.The PresentationElement abstract class provides an interface for graphicaluser managment classes (GUI). This serves two purposes:  - To help in design level organization of GUI elements (this eases the    study of the class hierarchy)  - To provide a place to locate possible future operations, common to    all GUI classes and private utility/supporting GUI classes     (but none of these as been detected yet)Note that as Vitral SDK is a computer graphics oriented architecture,in its model the rendering operations are modelled apart from presentationfeatures, so, RenderingElement's are modelled in a different classhierarchy.*/public abstract class PresentationElement {    ;}//===========================================================================//= EOF                                                                     =//===========================================================================