This module provides abstruct syntax tree for markdown.
Represents an item in the ListBlock.
* First `ListItem` content for this unordered `ListBlock`
Child element for the first `ListItem`.
1. This `ListItem` is in the child `ListBlock` for the First `ListItem` content.
1. This `ListItem` is also in the child `ListBlock` for the First `ListItem` content.
* Second `ListItem` content for this unordered `ListBlock`
Represents markdown section.