Document metadata attributes

[kevinlang]

A common usecase for djot will be blog posts. One thing that markdown lacked are document-level attributes such as title, date, or author. Instead, one typically uses non-spec-compliant frontmatter to capture that information that can later be read and used.

Asciidoc, by contrast, has document metadata attributes that capture this common information.
https://docs.asciidoctor.org/asciidoc/latest/attributes/document-attributes-ref/#document-metadata-attributes

Are there any plans to add document metadata attributes to djot? Right now it seems that the best approach, if I were to use djot, is to do the same as I do in markdown with "frontmatter" that is manually separated out and parsed separately, while the main body goes to the djot parser/renderer.

[kevinlang]

Seems like this is covered in #35