Name 

Description 

Activation Bar (UML 1.5) 

Modeling automatically renders the activation of messages that show the period of time that the message is active. When you draw a message link to the destination object, the activation bar is created automatically.
You can extend or reduce the period of time of a message by vertically dragging the top or bottom line of the activation bar as required. A longer activation bar means a longer time period when the message is active. 

Conditional Block (UML 1.5) 

Conditional block statement is a flexible tool to enhance a sequence diagram. The following statements are supported:

• if
• else
• for
• foreach
• while
• do while
• try
• catch
• finally
• switch
• case
• default

 

UML 1.5 Message 

By default, message links in a sequence diagram are numbered sequentially from top to bottom. You can reorder messages.
A “self message” is a message from an object back to itself. 

Nested Message (UML 1.5) 

You can nest messages by originating message links from an activation bar. The nested message inherits the numbering of the parent message.
For example, if the parent message has the number 1, its first nested message is 1.1. It is also possible to create message links back to the parent activation bars. 

UML 1.5 Collaboration Diagram Definition 

Class diagrams are static model views. In contrast, interaction diagrams are dynamic, describing how objects collaborate. 

UML 1.5 Interaction Diagram Elements 

The table below lists the elements of UML 1.5 Interaction (Sequence and Collaboration) diagrams that are available using the Tool Palette.
UML 1.5 interaction diagram elements  

UML 1.5 Sequence Diagram Definition 

Class diagrams are static model views. In contrast, interaction diagrams are dynamic, describing how objects collaborate.