text: /**~UML Diagramming Interchange~
   * UMLStructureDiagram [Abstract Class]
   * 
   * Description
   * 
   * The most general class for UMLDiagrams
   * depicting structural elements.
   * 
   * Generalizations
   * 
   * UMLDiagramWithAssociations
   * 
   * Specializations
   * 
   * UMLClassDiagram, UMLComponentDiagram,
   * UMLCompositeStructureDiagram, UMLDeploymentDiagram,
   * UMLObjectDiagram, UMLPackageDiagram, UMLProfileDiagram
  **/