Mother class of all the classes managing the diagrams
Declaration :
Directly inherited by : UmlDiagram
Artifact : UmlBaseDiagram
| Operation saveIn | 
saves the diagram picture in the file whose pathname is given
 in argument, the produced file is a PNG file.
 The aspect of the diagram is :
 - its visible part in case it is open
 - the aspect specified by its prefered size and scale in case
   these last are specified (see menu on a diagram view)
 - else the default diagram aspect, which is probably not as you want
 On error return FALSE in C++, produce a RuntimeException in Java
Declaration :
| Operation UmlBaseDiagram | 
the constructor, do not call it yourself !!!!!!!!!!
Declaration :
All public operations : apply , applyStereotype , children , childrenVisible , defined_ , deleteIt , description , getIdentifier , identifier_ , isMarked , isToolRunning , isWritable , kind , markedItems , moveAfter , name , parent , properties , propertyValue , referencedBy , saveIn , set_childrenVisible , set_Description , set_isMarked , set_Name , set_PropertyValue , set_Stereotype , stereotype , supportFile , unload