A block-level element of text, such as a paragraph or code block.
A body of text.
An section of text inside a block, possibly with formatting.
Linking directly to entities is not picklable because of cyclic references
The summary of a comment, usually its first sentence.
The summary of a comment, usually its first sentence. There must be exactly one summary per body.
A body of text. A comment has a single body, which is composed of at least one block. Inside every body is exactly one summary (see scala.tools.nsc.doc.model.comment.Summary).