The first public review of the OASIS Business Document Naming and Design Rules Version 1.1 proposed OASIS Standard with new rules for creating JSON validation artefacts for JSON documents, complete with the OASIS Committee Note of all UBL 2.1 document types as JSON schemas and all UBL 2.1 example documents as JSON documents, begins February 1, 2017 and closes April 1, 2017:

https://www.oasis-open.org/news/announcements/ubl-2-1-json-alternate-representation-v1-0-and-business-document-naming-and-desig

The CCTS, XSD and XML rules are unchanged from the Version 1.0 that was released today.