frontmatter, backmatter, appendices etc.

[Omikhleia]

As the title says ;-) We'd need these at some point.

• ~~titlepage (internal title page recto, legalese on verso, etc.)~~
• frontmatter (usually with roman folios, no chapter numbering by default, etc.)
• (mainmatter)
• backmatter and appendices etc. with specific rules too..

EDIT. (Sept. 5, 2023) "title page" is a slightly different topic obeying different rules, to split from front/back matters (which are actual content).