More flexible schema for subheadings (starting with support for both subheadings and AU attributions).
More flexible schema for subheadings (starting with support for both subheadings and AU attributions).

oreillymedia/HTMLBook,macmillanpublishers/HTMLBook,gitenberg-dev/HTMLBook,wastemobile/HTMLBook,mushroomgithub/HTMLBook,gitenberg-dev/HTMLBook,mushroomgithub/HTMLBook,oreillymedia/HTMLBook,mushroomgithub/HTMLBook,wastemobile/HTMLBook,macmillanpublishers/HTMLBook,gitenberg-dev/HTMLBook,oreillymedia/HTMLBook,macmillanpublishers/HTMLBook