L-Parameter: Markers for Negative Condition (N_COND)

From Contribution: Adverbial subordinators in European languages

'unless p, q', 'if not p, q': the coming about of q depends on the nonfulfilment of p: '(only) if not p, q' (e.g. If you don't get there by 6 o'clock we'll leave without you; Unless you get there by 6 o'clock we'll leave without you.)