Extend CDS DDL to MongoDB as an "Open" technology?

I think it would be awfully clever if the DDL used in CDS(for both ABAP and Native Hana development) was extended to include semantics for document based databases(specifically MongoDB).

Thoughts?

In addition to it being the basis for HANA XS development, a future in which javascript and JSON are SAP server side technologies is evidenced by the following:

MongoDB Selected as the Core Content Management Component of SAP's Platform-as-a-Service (PaaS) Offering | Mong…

hana-odbc