include::foo.adoc[]

and more
>>>
Document
  { docMeta =
      Meta
        { docTitle = []
        , docTitleAttributes = Nothing
        , docAuthors = []
        , docRevision = Nothing
        , docAttributes = fromList [ ( "sectids" , "" ) ]
        }
  , docBlocks =
      [ Block
          mempty
          Nothing
          (Include
             "test/feature/include/foo.adoc"
             (Just
                [ Block mempty Nothing (Paragraph [ Inline mempty (Str "foo") ])
                , Block
                    mempty
                    Nothing
                    (Include
                       "test/feature/include/inc/bar.adoc"
                       (Just
                          [ Block mempty Nothing (Paragraph [ Inline mempty (Str "bar") ])
                          , Block
                              mempty
                              Nothing
                              (Include
                                 "test/feature/include/inc/baz.adoc"
                                 (Just
                                    [ Block
                                        mempty
                                        Nothing
                                        (Paragraph
                                           [ Inline mempty (Bold [ Inline mempty (Str "baz") ]) ])
                                    ]))
                          ]))
                ]))
      , Block
          mempty Nothing (Paragraph [ Inline mempty (Str "and more") ])
      ]
  }