Multiple sequences in a single file

[Pigrenok]

Hello!

It is not clear from specification whether the GFF3 file should be sorted by seqid or not if multiple seqid present in a file.

I received a file where it is not the case, e.g. first there are lines of type gene for multiple seqids and then multiple nRNA lines with the same set of seqids and with parents of the genes described above.

The reader I use (Sci-Kit Bio read function) reads each occurrence of seqid as new name. If specific sequence ID it provided, it reads only the first record (I presume because it encounters different seqid after that).

So, my problem is that because it is not specified, I cannot understand is it reader's behaviour incorrect or it is being strict and correct and the file itself is formatted incorrectly?

Thank you very much for clarification.