READING ACTS: Defining Apocalyptic Literature. This could be expressed a little more clearly.
John Collins has done important work on defining the literary genre "apocalypse," as summarized in the blog post. There is no "apocalyptic" genre. There have been various attempts to define "apocalyptic" as a worldview, but these definitions do not find the same general acceptance that the genre "apocalyse" does. After all, there are plenty of examples of apocalypses. Demonstrating the existence of a worldview is more difficult.
Collins defines the apocalyptic worldview as a belief in the active influence of supernatural entities (i.e., angels and demons) on human affairs, along with a belief in eschatological salvation involving the judgment of human beings after death.
Past posts in Phil Long's series on the Second Temple Period are noted here and links.