[Therion] context not working

I have been trying to use the context option using the example from the therion book (and a variation on it). point label -text "05 May 2012" -context point air-draught -scale xs point date -value 2012.05.05 -context point air-draught -scale xs Both these statements result in an error like this. error -- IG-InceptionPlan.th2 [383] -- object context not allowed -- point air-draught I presume this is a bug? Or is it not implemented like this? Also, with point date, can we control the format of the output, or are we limited to dd mm yyyy? (or perhaps it is looking at my system settings?) Bruce