[NTG-context] long caption in 2-page spread

[jbf]

The following excellent solution (see below) to a 2-page spread of an 
image was given me by Hans (I had been completely unaware of the command 
\startspread. It appears to be recent and undocumented, but it certainly 
simplifies matters).

But in my case the title is a lengthy sentence, rather than the 4-word 
'This is a cow'. And even though I have been able to split the line, 
e.g. title={this is my very, very, very,\\ very etc. etc. long title}, 
what happens is that part of the caption still appears on the right-hand 
page of the spread.

Is there a way that I can limit the appearance of the caption to just 
one (the left-hand) page? In other words, so the figure is spread but 
not the caption? Or alternatively, have the caption neatly split across 
the two pages with appropriate space inbetween? I tried various 
combinations, including an \hfill halfway through the title, but to no 
avail. Perhaps this is asking too much, but there may be a workaround.

Julian


\startpostponing
     \setuppagenumbering[state=stop]
     \startspread
         \startplacefigure[location=here,title={This is a cow!}]
         \externalfigure[cow.pdf][height=\textheight]%
         \stopplacefigure
     \stopspread
     \setuppagenumbering[state=start]
\stoppostponing