Right now SibeliaZ's GFF output does not comply strictly with the format spec. I am going to make it compliant in the next releases. The only difference that seems to matter for maf2synteny is that the ID attribute will be spelled in upper-case as in the specification (right now SibeliaZ outputs 'id' in lower-case). Please add support to the ID spelled this way. An example of the output file is here.
In addition, SibeliaZ will output sizes of the input sequences as pragma (as suggested by this issue). It should simplify the computation of the coverage and maybe some other operations.
Right now SibeliaZ's GFF output does not comply strictly with the format spec. I am going to make it compliant in the next releases. The only difference that seems to matter for maf2synteny is that the ID attribute will be spelled in upper-case as in the specification (right now SibeliaZ outputs 'id' in lower-case). Please add support to the ID spelled this way. An example of the output file is here.
In addition, SibeliaZ will output sizes of the input sequences as pragma (as suggested by this issue). It should simplify the computation of the coverage and maybe some other operations.