I would like to validate XML documents using RELAX NG schemata, and I would like to use the JAXP validation API.
From Googling around, it appeared that I could use J
I can't help you with the JAXP validation API, but Nux provides a class that can validate virtually every type of schema known to man. Regarding RELAX NG schemata, use this factory method to create the relevant validator object.