[%deflabel fieldname "the name of line fields"]
[%info](dsp="gtf file"; filetype="plaintext"; encode="ascii")
[1]<string; ="#gtf-version 2.2">(dsp="gtf version line", re="^#gtf-version\s\d+\.\d+", end="\n")
[$*] <string>(dsp="gtf information lines"; re="^#!.+")
[$+] {
[1] {
[1] <string> (dsp="name of the chromosome or scaffold"; fieldname="seqname")
[1] <string> (dsp="name of program that generated this feature"; filename="source")
[1] <string; ={'CDS', 'gene', 'stop_codon', 'start_codon', 'exon', 'transcript'}>
(dsp="feature type name"; fieldname="feature")
[1] <string> (dsp="Start position* of the feature, with sequence numbering starting at 1"; datatype=int; fieldname="left")
[1] <string> (dsp="End position* of the feature, with sequence numbering starting at 1"; datatype=int; fieldname="right")
[1] <string> (datatype=float; fieldname="score")
[1] <string; ={"-", "+"}> (fieldname="orientation")
[1] <string; ={"0", "1", "2"}> (dsp=""; fieldname="frame")
[1] {
[$+] {
[1] <string> (dsp="one attribute", re='^.+\s".+";\s')
}
} (dsp=""; fieldname="attribute")
} (dsp="gtf information lines"; end="\n"; sep="\t")
} (dsp="record lines")
[1] <string; ="###"> (dsp="last line", end="\n")
