version=4
# Upstream is frozen at 4.5; oasis-open.org directory listing returns 522
# but direct file access works: https://www.oasis-open.org/docbook/xml/4.5/docbook-xml-4.5.zip
https://www.oasis-open.org/docbook/xml/4\.([\d]+)/docbook-xml-([\d\.]+).zip
