[lojban] rp-expression-tail ordered choice with empty grouping

[".alyn.post." <alyn.post@lodockikumazvati.org>]

What does the following production in the lojban grammar mean?:

rp-expression-tail <- rp-expression operator rp-expression-tail / ()

Do I understand that to mean 'the sequence of rp-expression,
operator, and rp-expression-tail OR nothing?'  Could the above also
be expressed:

rp-expression-tail <- (rp-expression operator rp-expression-tail)?

And if so, why the odd way of specifying it?  I'm weak on pitfalls
of recursive behavior in grammars, am I looking at a workaround
related to that?

-Alan
-- 
.i ko djuno fi le do sevzi

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