`TMarkdownTextBlock`
pt		SetClosed
		Create
		Destroy

`TMarkdownLeafBlock`

`TMarkdownBlock`
pt		SetClosed
pt		GetChild
pt		GetChildCount
pt		AddChild
pt		GetLastChild
		Create
		Destroy
		Dump
		GetFirstText
		PlainText
		ApplyAttributes
		WhitespaceMode
		ContentIndentation

`TMarkdownElement`