installation

I just downloaded all the modules, however the references used in the
stylesheets to other stylesheets don't seem to conform to the directory
structure or even the names of some of stylesheets I downloaded. E.g.
the node-set directory is installed under the .../exsl/functions
directory, however in the .../exsl/exsl.xsl file it makes references as
if the node-set directory was in the exsl directory:

   <import href="node-set/exsl.node-set.xsl"/>

There are other such errors.  Are the downloaded scripts out of sync
with each other?

Thanks,
Jeff