_section: Hello World @<link-to-this-section>

_subsection: Some Example @<link-to-this-subsection>

_heading: Large Bold Text @<link-to-this-heading>

_definition: Flatworm
A phylum of relatively **simple** bilaterian, unsegmented,
soft-bodied invertebrates.

_property: String.fromCharCode(code) => string
Returns a string created from //code//, a sequence of
UTF-16 code units.

_code: filename.js

_toc:
    some-file
    some-directory

_null:
This breaks out of a directive. For example, to end a
_definition and reset the indentation.