The license situation for EXSLT is not absolutely clear. This email seems to be
the clearest answer.

http://lists.fourthought.com/pipermail/exslt-manage/2004-June/000603.html

Subject: [exslt-manage] License?
Date: Tue Jun 29 08:11:55 MDT 2004
From: Uche Ogbuji uche.ogbuji at fourthought.com

On Sun, 2004-01-25 at 10:27, Ross Gardler wrote:
> I would like to use some of your templates in my contributions to Apache 
> Forrest (http://xml.apapche.org/forrest). However, I don't want to 
> download your whole package if I can avoid it. My problem is that I 
> can't find any license information on your site and so am not sure if 
> your license is compatible with the Apache License or if allows me to 
> use portions of your work without redistributing the whole.
> 
> Please add this information to your web site and your distributions.

I'm catching up on EXSLT e-mail and I'm very sorry that none of the
managers has responded to your question.

You're free and clear to use the templates, but you should credit and
link to exslt.org.  As for copyright, there is no legal entity for
EXSLT, but you can credit the original individual managers as follows:

EXSLT templates are Copyright 2001-2004 Jeni Tennison, David Pawson,
James Fuller and Uche Ogbuji

There is no "license" as such, although I started discussion for
choosing one (probably a creative commons license).  You're not required
to attribute or post notice, so you'd be fine within the Apache license,
but I'd encourage you to pass on this attribution request, anyway.

Thanks.


-- 
Uche Ogbuji                                    Fourthought, Inc.