Hi, I am following the guide at [1] with the aim of loading some XML with a variety of DTD doctypes. I have a catalog.xml set (which works in another app) and in lib/custom I have - saxon-he-10.9.jar - xmlresolver-5.2.2-data.jar - xmlresolver-5.2.2.jar - xmlresolver.properties It is not working as I hoped. Is there a way to get debug info from xmlresolver to a file without going to the Java level? The guide says "You must configure your environment with an appropriate logging backend." [2] I guess this is about SLF4J <http://www.slf4j.org/> but I have no experience here. /Andy [1] https://docs.basex.org/wiki/Catalog_Resolver [2] https://xmlresolver.org/ch06#xml.catalog.defaultLoggerLogLevel