What's the difference between archetype.xml and archetype-metadata.xml in Maven

The main takeaway from the accepted answer above was to use archetype-metadata.xml instead of archetype.xml, with a <requiredProperties> element, as well as a <filesets> element for the resources I want included. In archetype.xml it was a <resources> tag. Also give the archetype a <packaging>maven-archetype</packaging>.

Still not totally clear though what the difference is between archetype.xml and archetype-metadata.xml. Assume archetype.xml is deprecated?