[antlr-interest] Return Values and Element Labels ?= S-Attribute Grammar

[qn]

Hi, as far as I understand, using return values and element labels in 
Antlr are sufficient to build an AST. e.g.

r[int a, String b] returns [int c, String d] :   a='class' b=ID  ... 
{$c=$a; $d=$b;}

What's the name of this kind of extension to eBNF? Is this called a 
S-Attribute Grammar?

-stefan

P.S. is there newsgroup access to this mailinglist?