portlet markup accessibility

We've been looking at accessibility issues related to
cnx.org, and our 
accessibility expert has an issue with portlets being styled
as 
definition lists: namely, they're not definitions, and also
DLs aren't 
as skippable as other structures, like ULs, for example.

I was wondering: is there any more rationale behind this
choice than 
"DLs are more structured than DIVs" (which is the
only thing I can find 
online)?

          --jcc

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