DOCBOOK-APPS: Public ID for NW's XSL stylesheets?

Hello,

I'd like to know if there is an official public ID for the Norman Walsh
XSL stylesheets, because I want to use catalog mechanisms with them. For
DSSSL I 've found:

PUBLIC "-//Norman Walsh//DOCUMENT DocBook Print Stylesheet//EN"
  print/docbook.dsl
...

Is there something equivalent for XSL?
Thanks.

BG