DOCBOOK-APPS: Error with Xalan-J 2.4.0 and DocBook XSL 1.58.1

I just downloaded version 1.58.1 of the DocBook XSL stylesheets for 
testing, and I am getting this error quite a bit using Xalan-J 2.4.0:

file:///home/users/patrick/docbook-xsl-1.58.1/common/gentext.xsl; Line 
130; Column 57; XSLT Error (javax.xml.transform.TransformerException): 
Variable accessed before it is bound!

If I use Saxon, there is no error (though I have not reviewed the 
rendered documents for correctness yet).  Before I switch everything over 
to Saxon, I want to be sure that this is a problem with Xalan and not the 
new stylesheets.  I have attached the smallest example I could come up 
with that causes the error.  Thanks.

  -Patrick


-- 
Patrick L. Hartling                     | Research Assistant, VRAC
                | 2624 Howe Hall: 1.515.294.4916
http://www.137.org/patrick/             | http://www.vrac.iastate.edu/