this class manages sequence diagram definition
Declaration :
Directly inherited by : UmlSequenceDiagramDefinition
Artifact : UmlBaseSequenceDiagramDefinition
| Operation instances | 
return the instances present in the diagram
Declaration :
| Operation messages | 
return the messages present in the diagram,
 ordonned following the sending time
Declaration :
| Operation fragments | 
return the fragments present in the diagram
Declaration :
| Relation _instances (<directional composition>) | 
Declaration :
Stereotype: vector
| Relation _messages (<directional composition>) | 
Declaration :
Stereotype: vector
| Relation _fragments (<directional composition>) | 
Declaration :
Stereotype: vector
| Extra Class Member qsort | 
Definition :
| Operation read_ | 
internal, don't call it
Declaration :
| Operation ~UmlBaseSequenceDiagramDefinition | 
  to avoid compiler warning, don't call it
Declaration :
| Extra Class Member friend | 
Definition :
friend class UmlBaseSequenceDiagram;
All public operations : fragments , instances , messages , read_