(registered 2020-08-17, last updated 2020-08-19) Media type name: text Media subtype name: gff3 Required parameters: The "charset" parameter is required as there is no default charset. Nevertheless, for portability with other systems, use of UTF-8 is recommended. Optional parameters: None Encoding considerations: 8bit Some whitespace and delimiter characters are URL-encoded; see the specification for details. Security considerations: The GFF3 format is descriptive and does not "include provisions for directives that institute actions on a recipient's files or other resources". It is a simple tab-delimited text format, but nevertheless the usual precautions apply when parsing new GFF3 files, in case they are accidentally or maliciously broken. Interoperability considerations: Line-ending characters depend on the originating operating system, such as CR LF for Windows, CR for Macintosh and LF for Unix. Published specification: https://github.com/The-Sequence-Ontology/Specifications/blob/master/gff3.md Applications which use this media: The GFF3 format is used in bioinformatics to output, export and exchange descriptions of various features on biological sequences such as nucleic acids or proteins. It is used by command-line tools and by web services such as genome browsers. Fragment identifier considerations: None Restrictions on usage: None Additional information: 1. Deprecated alias names for this type: text/x-gff3 2. Magic number(s): Although no byte sequences can be counted on to always be present, GFF3 data in ASCII-compatible character sets (including UTF-8) often begin with hexadecimal 23 23 67 66 66 2d 76 65 72 73 69 6f 6e 20 33 ("##gff-version 3"). 3. File extension(s): gff3 4. Macintosh file type code: None 5. Object Identifiers: None General Comments: Person to contact for further information: 1. Name: Sequence Ontology 2. Email: song-devel&lists.utah.edu Intended usage: Common The GFF3 is a standard format in bioinformatics. Author/Change controller: Sequence Ontology