As reported by Ralph at https://github.com/tigase/tigase-pubsub/pull/5#issuecomment-883468510, this was an error in XEP - meta-data was replaced with metadata which it shouldn't be.
meta-data
metadata
As reported by Ralph at https://github.com/tigase/tigase-pubsub/pull/5#issuecomment-883468510, this was an error in XEP -
meta-datawas replaced withmetadatawhich it shouldn't be.