DD0054: Missing Class value

[sherry-chou]

def:Class would be needed, and is missing from both define-360i.json and .xml, needs to be e.g.,:
<def:Class Name="INTERVENTIONS"/>

[sherry-chou]

class information can be retrieved from CDISC Library endpoints, e.g.:
https://api.library.cdisc.org/api/mdr/sdtmig/3-4/classes/Events/datasets

Events_datasets.json