xml:base and DocBook stylesheets

My toolchain includes documents from various directories using XInclude. 
xml:base attributes are applied as necessary to keep relative URIs 
pointing at the right locations. This all seems to work well enough with 
the XSL-FO stylesheets. I.e. the pictures show up in the right places in 
the PDF output. However, with HTML and XHTML output this fails. IN 
particular, in the XHTML output, I'm seeing images like this:

<img 
src="file:/Users/elharo/Projects/workspace/CS905/build/week13////Users/elharo/Projects/workspace/CS905/build/awt.gif" 
width="107"/>

That should be 
file:/Users/elharo/Projects/workspace/CS905/build/week13/awt.gif


The DocBook input looks like this

<chapter 
xml:base="file:///Users/elharo/Projects/workspace/CS905/build/week13/week13.xml">
...
<imagedata fileref="awt.gif" width="107px" depth="140px"/>
...
</chapter>


My guess is that the stylesheets are not properly handling cases like 
this when keep.relative.image.uris is 0. It appears to be resolving the 
relative URLs against the document's base URI rather than the actual 
base URI specified by xml:base. Thoughts?


-- 
Elliotte Rusty Harold  
Java I/O 2nd Edition Just Published!
http://www.cafeaulait.org/books/javaio2/
http://www.amazon.com/exec/obidos/ISBN=0596527500/ref=nosim/cafeaulaitA/