How to Implement IMigrator - OndraZizka/jboss-migration GitHub Wiki
Start with AbstractMigrator.
Don't forget to copy jaxb.properties from other *.jaxb package to activate MOXy JAXB.
After getting the AS 5 config data,
for starters, create a ManualAction and use addWarning() to inform the user about what's not implemented and thus skipped.
Use available aparatus - look at the *Utils classes.