The following elements occur in taskprerequisites: address, anchor, annotation, bibliolist, blockquote, bridgehead, calloutlist, caution, classsynopsis, cmdsynopsis, constraintdef, constructorsynopsis, destructorsynopsis, epigraph, equation, example, fieldsynopsis, figure, formalpara, funcsynopsis, glosslist, important, indexterm (db.indexterm.endofrange), indexterm (db.indexterm.singular), indexterm (db.indexterm.startofrange), info (db.titleforbidden.info), info (db.titleonly.info), informalequation, informalexample, informalfigure, informaltable (db.cals.informaltable), informaltable (db.html.informaltable), itemizedlist, literallayout, mediaobject, methodsynopsis, msgset, note, orderedlist, para, procedure, productionset, programlisting, programlistingco, qandaset, remark, revhistory, screen, screenco, screenshot, segmentedlist, sidebar, simpara, simplelist, synopsis, table (db.cals.table), table (db.html.table), task, tip, title, titleabbrev, variablelist, warning.