Should core media types be defined in EPUB?

[dauwhe]

There does seem to be a tradeoff inherent in some of these external registries and other documents. It's easier to maintain a registry, but it makes it harder to read the spec when essential information is outside the spec. Especially with core media types, do we envision adding or deprecating core media types outside of an actual revision of EPUB?

[mattgarrish]

do we envision adding or deprecating core media types outside of an actual revision of EPUB

The problem with embedding in a spec is that it looks silly when new media types are rolled out that are fully supported by browser engines, yet are artificially invalid for use in EPUBs because there needs to be a full revision of the specifications before anyone can bless them into existence (or when something needs deprecating, like text/javascript). When it was taking three years per revision, that was a long time to sit waiting to make any modification.

But another thought would be to instead make the CMT document a staging ground. These media types could fall somewhere between the ones fully recognized in the specification and foreign resources (noted in epubcheck, for example, but not errors or warnings).