I started with: ftp://ftp.ncbi.nlm.nih.gov/gene/DATA/ASN_BINARY/Mammalia/Sus_scrofa.ags.gz
and converted it to XML: ./gene2xml.linux -i Sus_scrofa.ags -b T -c T
(gene2xml.linux from ftp://ftp.ncbi.nlm.nih.gov/asn1-converters/by_platform/linux/gene2xml.linux.gz)
Are you aware of any tools to make such conversion?
I am OK with a simplistic GFF with gene-transcript-exons info only.