librngom-java binary package in Ubuntu Focal arm64

 RNGOM is an open-source Java library for parsing RELAX NG grammars.
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 In particular, RNGOM can:
  * parse the XML syntax
  * parse the compact syntax
  * check all the semantic restrictions as specified in the specification
  * parse RELAX NG into application-defined data structures
  * build a default data structure based around the binarized simple syntax
    or another data structure that preserves more of the parsed information
  * parse foreign elements/attributes in a schema
  * parse comments in a schema

Source package