Actually, the XSLT 2.0 specification says that in the dynamic context for
use-when, the set of Available Documents is empty, which means that doc() or
document() ought to fail rather than calling the URIResolver. So it seems
you might be relying on a non-conformance in the Saxon implementation -
though I can't say it's one that I am motivated to remove.

Michael Kay
Saxonica 

> -----Original Message-----
> From: Vladimir Nesterovsky [mailto:vladimir@xxxxxxxxxxxxxxxxxxxx] 
> Sent: 30 August 2008 10:49
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: Re:  use-when in the xsl:inlcude
> 
> > Is there something I can pass to xslt for it to evaluate that 
> > something in the use-when attribute in the xsl:inlcude, and 
> xsl:import?
> > 
> > In particular I'm using saxon in java.
> 
> I think I have found a clean way to achieve the desired effect.
> I'll define an uri resolver that among others will resolve 
> uri like "configuration:data".
> 
> Thus I can write:
> 
> <xsl:include href="..." 
>   use-when="document('configuration:data')/data/xs:boolean(@xxx)"/>
> 
> I guess, this approach has a virtue to be almost processor 
> independent.
> 
> Thanks.
> --
> Vladimir Nesterovsky
> http://www.nesterovsky-bros.com