module Transform:sig..end
val string_to_item : ?filename:string ->
       ?tags:Biocaml_gff.tag list ->
       unit ->
       (string, (Biocaml_gff.stream_item, Biocaml_gff.parse_error) Core.Result.t)
       Biocaml_transform.tBiocaml_transform.t for a given version.val item_to_string : ?tags:Biocaml_gff.tag list ->
       unit -> (Biocaml_gff.stream_item, string) Biocaml_transform.t