XPath Push/Pull Was: RE: Incremental transformations with Xalan and performance issues?

[Kevin Jones <kjouk@yahoo.co.uk>]

On Tuesday 07 December 2004 09:26, Michael Kay wrote:
> In Saxon today,
> many expressions can be evaluated in either pull or push
> mode, and the goal I'm pursuing is to keep both, while
> reducing the number of push/pull conflicts. The subject
> of a future paper perhaps.

I am curious how you decide which to choose, is this just 
down to the context/structure of the expression or are 
there other criteria involved?

Thanks,
Kev.