[antlr-interest] (newbie)The rules to create tree walkers

[ali azimi]

Hi,
   
  In the following,  antlr complains that instead of RPAREN found '?'
   
  packageReferenceClause
 :^(USE packageName ^(PACKREFCLS definitionSelectionList)? end)
  ;
   
  1)how should I write the above, to preserve the structure? I can write it in the following form, but it is not the same as the one mentioned above.
   
  packageReferenceClause
 :^(USE packageName ^(PACKREFCLS definitionSelectionList?) end)
  ;
  
 and could you give me some advice as to where I can find some more tutorials about creating tree walkers or maybe some examples?
   
  Many thanks in advance.
   
  Best regards,
   
  Al

       
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