Conditionals?,
(Head,
((((BridgeHead|List|ListContinue|Para)|
(Caution|Note|Warning)|
(Equation|ExampleBlock|FigureFrame|ParaNoWrap|LabeledList|
LabeledListTight|LabeledListWide|LabeledListWideTight|
SyntaxDiagram|Table|ExampleBlockVerbatim))*)))