EDIT

updating poms for branch'release/5.28.0' with non-snapshot versions

ref #9804 improve handling for empty categorical data (empty or null value state data)

fix #9831, ref #9477 fix failing term loading for unordered missing terms

adapt getIdentifier methods

fix #9833 remove cascading in DDS to descriptions

ref #9833 remove cascading in DDS to descriptiveSystem, geoFilter and subtreeFilter

ref #9830 add accent to México Distrito Federal in TdwgArea.csv

cleanup and javadoc

cleanup

ref #9798 add also Spanish translation for country (label of vocabulary)