5. The system of claim 2 wherein parent-child associations are maintained between graphical symbol templates and graphical symbol instances created from the graphical symbol templates.
5. The system of claim 2 wherein parent-child associations are maintained between graphical symbol templates and graphical symbol instances created from the graphical symbol templates. 8. The system of claim 5 wherein the parent-child relationship between a graphical symbol template and a graphical symbol instance is identified by a unique ID assigned to each child graphical symbol instance created from the graphical symbol template.