On 23 Jun 2008, at 06:19, Dave Cridland wrote:
A final point is that actually phrasing it as "MUST X or Y" is
problematic since English lacks the possibility of parenthesis for
precendence - hence a stronger binding, such as MUST X unless Y, is
preferable.
Preferable to me would be to avoid such ambiguity altogether by
breaking things down into simpler atoms ("If Y then MUST X; if !Y then
MAY X", or whatever the context supports). More complex constructions
seem certain to lead to confusion to native readers of English, never
mind those whose more usual tongue is something else.
Joe
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