Provide an optional parameter for sequencediagram environment serving as a caption

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I want achieve a result similar to Figure 2 at 
http://www.ibm.com/developerworks/rational/library/3101.html. A caption in a 
sequence diagram is useful for referring to it from other sequence diagrams. It 
should appear as if the sequence diagram is inside a block.

Original issue reported on code.google.com by [email protected] on 17 Nov 2011 at 2:48

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Original comment by [email protected] on 17 Nov 2011 at 4:51

• Changed state: Accepted
• Added labels: Type-Enhancement
• Removed labels: Type-Defect