Nevertheless, while the exact date of default is up for debate, most analysts see it as a likely outcome. (oilprice.com)
- the last modification date of the default Rendition of the target EPUB Publication, as part of the (idpf.org)
When an EPUB Container includes more than one Rendition of an EPUB Publication, updating the last modified date of the default rendition for each release — even if it has not been updated — will help ensure that the EPUB Publication does not appear to be the same version as an earlier release, as Reading Systems only have to process the default rendition. (idpf.org)