• Generic

• Text

• Markdown (CommonMark)

• YAML

• JSON

• YFM-Markdown (Markdown with YAML front matter)

• JFM-Markdown (Markdown with JSON front matter)

• MIME Messages

Each file consists of one or more file parts. The content model of a file is described in terms of

• body parts (containing true file content like text or image data) and / or
• container parts (each consisting of one or more subparts).

A container part may either be a

• subpart sequence (a predefined sequence of subparts of particular types) or a
• subpart choice (one of several allowed subpart types)

and may be repeated more than once.