[NTG-context] cross-reference query solved

[jbf]

To those who assisted me with helpful hints yesterday, thank you. I 
finally got the cross-referencing working correctly after examining my 
overall structure in the light of those hints.

I think that what was preventing things from working properly, was that 
I had all the entries for a particular chapter enclosed in a setup. I 
won't go into why I had adopted that approach, but in restructuring 
things far more sensibly, I was able to do away with the \start\...\stop 
setups. I think this is what was causing the problem.

Julian