[Oberon] Possible typo in Zonnon EBNF description

[Aubrey.McIntosh at Alumni.UTexas.Net]

I am looking at section /11. Constants on page 57 of the July 28, 2009
Zonnon language report.
The production ScaleFactor includes the term ["+" | "" ]
I suspect this should be ["+" | "-" ]

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Aubrey McIntosh, Ph.D.
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