Schema validation and conversion based on RELAX NG

Current version

jing-trang requires the following formula to be installed:
ant 1.10.3 Java build tool

Recent formula history

Andrew Janke jing-trang: require Java 8 specifically (#24033)
ilovezfs jing-trang: depend on ant instead of :ant
ilovezfs Use “squiggly” heredocs.
Alexander Holupirek jing-trang: allow higher versions of Java (#18179)
Viktor Szakats jing-trang: secure url(s)

Formula code at GitHub