Report some `epub:type`s in the data section?

@laudrain suggests that some `epub:type` properties could be reported in the data section.

1. high level for logical structure:
- level 1: **frontmatter**
and inside, level 2: **cover, tiltepage, copyright-page, ...**
- level 1: **bodymatter**
and inside, level 2: **part, chapter, subchapter, division**
- level 1: **backmatter**
and inside, level 2: **appendix, credits, index**

2. specifics:
- **pagebreak** for page navigation checks
- **footnote, endnote** for notes in HTML aside