[ Para
    [ Str "External"
    , Space
    , Link
        ( "" , [ "external" ] , [ ( "title" , "ext" ) ] )
        [ Str "link" ]
        ( "https://example.com" , "" )
    , Space
    , Str "reference."
    ]
, Para
    [ Str "Plain"
    , Space
    , Link
        ( "link1" , [ "ref" ] , [ ( "key" , "value" ) ] )
        [ Str "link" ]
        ( "https://example.com" , "" )
    , Space
    , Str "too."
    ]
]
