There isn't a mechanism for doing this.  Are you talking about external
data entities or external parsed entities?  If the former, there is an
issue (data-entity) on this, but I suspect it will be tough to get
support for this in, given how little external data entities seem to be
used in the XML world.  If the latter, I don't understand why you would
need it.

Pete Johnston wrote:
> 
> Back in October, Tony Graham asked (with reference to the previous
> WD):
> 
> > Under the current XSL WD, is there any way, analogous to DSSSL's
> > entity-system-id procedure, to get the system identifier of an
> > external entity named in an ENTITY attribute value?
> 
> Has anyone any ideas on whether there is a mechanism for
> doing this please?



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