While we're on the subject of Panorama's use of attributes, has anyone
discovered a way to build a navigator which includes certain elements only
when they have particular attribute values? What I'd like to do is
include <c02><unittitle> only when <c02 level="subseries">. We are now
using <did> rather than <drow> throughout the entire container list.
Mary Lacy
Manuscript Division, Library of Congress
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