[abstract]
--
This is an abstract quote block.
--
>>>
Document
  { docMeta =
      Meta
        { docTitle = []
        , docTitleAttributes = Nothing
        , docAuthors = []
        , docRevision = Nothing
        , docAttributes = fromList [ ( "sectids" , "" ) ]
        }
  , docBlocks =
      [ Block
          Attr
          ( [ "abstract" ] , fromList [] )
          Nothing
          (OpenBlock
             [ Block
                 mempty
                 Nothing
                 (Paragraph
                    [ Inline mempty (Str "This is an abstract quote block.") ])
             ])
      ]
  }