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I'm missing something... why not just use Table +
AppendMatch? If what you want to do is return "abc" as the
value from some group, why does it matter whether it's a
Table or a SubTable? (Since the Table doesn't report it's
results tuple when it does an AppendMatch).

Set _m_productionName = AppendMatch on your processor object
and the production will get reported as a simple string
(though, to be quite frank, not sure I've got a test for
AppendMatch in the test suite at the moment). If you have a
grammar:

a := b,c,(d,e)

where you wanted SubTable + AppendMatch for (d,e), then use:

a := b,c, f
f := (d,e)

and make _m_f = AppendMatch.