I've added this information to the Saxon Wiki at
http://saxon.wiki.sourceforge.net/ which is a good place to capture hints
and tips like this. Anyone can add to it; I will try to organize the
contributions to keep it accessible and pertinent.

Michael Kay
http://www.saxonica.com/

> Kernow has a CustomStandardCollectionURIResolver which uses a 
> CustomEntityResolver just for this purpose - it caches the 
> DTDs referenced in the XML files when they're read using the 
> collection() function.
> 
> This way they are only fetched once per transform and then re-used.
> If you prefer you can save local copies and point Kernow at 
> the local directory so that it doesn't access the net at all.
> 
> Kernow can now be run 3 ways - using the GUI, called from 
> Java using its API or run from Ant so it has the potential to 
> slot in wherever you are currently using Saxon.
> 
> http://kernowforsaxon.sourceforge.net/
> 
> cheers
> andrew