[BUG] Unable to connect to OxygenXML

[marmoure]

When trying to add Elemental as a data source in OxygenXML it will throw this error

Check datasource configuration. Could not instantiate: ro.sync.db.nxd.exist.ExistSession due to: 

java.lang.NoClassDefFoundError: xyz/elemental/mediatype/MediaType

steps to reproduce

1. From a clean instance of Elemental 7.x.x and fresh install of OxygenXML eg 28.1
2. Add Elemental as data source and apply it.
3. In the Data Source Explorer you will see the error show up when you try to navigate in the DB.

Expected behavior

OxygenXML should connect and Browse Database