How to use {session-context} in sitemap?

[Joel McConaughy]

I'm trying to access the session context from the sitemap using 
{session-context:session/attribute} syntax as described in the session 
docs but am getting an empty value.   It looks like I have properly set 
the session attribute but that the core.session-manager can't find it.  
What am I doing wrong? 
Cocoon 2.1.5, Tomcat 5.0.19

Thanks, joel
From flow:
cocoon.session.setAttribute('covers', 'sampledata/covers');
var s = cocoon.session.getAttribute('covers');
// At this point, s == 'sampledata/covers/'
From sitemap.xmap:
<map:pipeline>
<map:match pattern="getImage">
<map:read 
src="{session-context:session/covers}/{request-param:upc}.jpg" 
mime-type="image/jpeg" />
</map:match>

From core.log:
SESSION ATTRIBUTES:
PARAM: 'covers' VALUE: 'sampledata/covers'
DEBUG   (2004-08-14) 11:33.37:252   [core.session-manager] 
(/cocoon/pp/getImage) http8080-Processor23/DefaultContextManager: BEGIN 
getContext name=session
DEBUG   (2004-08-14) 11:33.37:252   [core.session-manager] 
(/cocoon/pp/getImage) http8080-Processor23/DefaultContextManager: END 
getContext context=null


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