53     def accept(self, visitor):  argument
54       visitor.visitDocument(self)
56           element.accept(visitor)   
57       visitor.leaveDocument(self)
80   def accept(self, visitor):  argument
82          visitor.visitSection(self)
84              element.accept(visitor) 
86              element.accept(visitor)    
87          visitor.leaveSection(self)   
114     def accept(self, visitor):  argument
115       visitor.visitTable(self)
125     def accept(self, visitor):  argument
126       visitor.visitText(self)
136     def accept(self, visitor):  argument
137       visitor.visitBarChart(self)
155     def accept(self, visitor):  argument
156       visitor.visitHistory(self)