Although earlier versions of InDesign have had support for Digital Editions Export (EPUB), up until the most recent release of InDesign (CS5), we would have had to change the way in which our documents were laid out in order to best prepare them for EPUB output. This was primarily due to the fact that the content order of the EPUB would be based on the document’s Page Layout. InDesign CS5 enables content order creation based on Page Layout or XML Structure.