dbfo_float-type — Specifies float behavior for a sidebar
<?dbfo float-type="margin.note"?>Use the <?dbfo float-type?> PI to specify the float
      behavior for a sidebar (to cause the sidebar to be
      displayed as a marginal note).
Specifies that the sidebar should be
            displayed as a marginal note.
sidebar.float.type (parameter),
      sidebar.float.width (parameter), 
      sidebar.properties (attribute-set),
      sidebar.title.properties (attribute-set)