Refer to <<Section A>>.

== Section A
>>>
Document
  { docMeta =
      Meta
        { docTitle = []
        , docTitleAttributes = Nothing
        , docAuthors = []
        , docRevision = Nothing
        , docAttributes = fromList [ ( "sectids" , "" ) ]
        }
  , docBlocks =
      [ Block
          mempty
          Nothing
          (Paragraph
             [ Inline mempty (Str "Refer to ")
             , Inline mempty (CrossReference "Section A" Nothing)
             , Inline mempty (Str ".")
             ])
      , Block
          Attr
          ( [] , fromList [ ( "id" , "_section_a" ) ] )
          Nothing
          (Section (Level 1) [ Inline mempty (Str "Section A") ] [])
      ]
  }