Before converting from one format to another, Peregrin validates the original ebook. In the case of Ochooks, it checks for an ochook.manifest file and a reference to this in the tag of index.html.
But when designing an ebook, it's helpful to test the conversion to EPUB with a single command, without having to zip up the directory into a Zhook first, and without having to manually maintain a manifest file.
Before converting from one format to another, Peregrin validates the original ebook. In the case of Ochooks, it checks for an ochook.manifest file and a reference to this in the tag of index.html.
But when designing an ebook, it's helpful to test the conversion to EPUB with a single command, without having to zip up the directory into a Zhook first, and without having to manually maintain a manifest file.