The epub:type attribute [ContentDocs32] is REQUIRED
Discerning the available values of epub:type
is a tangle... The referenced epub:type
related section in the ContentDocs32 document references the Vocabulary Association paragraph which in turn references the Vocabulary Association Mechanisms section within this current document. From that section the default vocabulary can/may be found, but there is no reference there (or in any of these other sections) to the available epub:type
values nor to their "meaning"/value to the author or implementer.
However, just below this in the example (and above in relation to pagebreak
there is a link directly to the defining defaults in the EPUB-SSV.
It would be helpful for authors and implementers to know first about the SSV list, and then about the ability to extend the vocabulary.