Early Review of draft-ietf-anima-constrained-voucher-00
review-ietf-anima-constrained-voucher-00-yangdoctors-early-moberg-2018-07-20-00

I have reviewed this document as part of the YANG doctors directorate's
ongoing effort to review all IETF documents being processed by the IESG.  These
comments were written with the intent of improving the operational aspects of
the IETF drafts. Comments that are not addressed in last call may be included
in AD reviews during the IESG review.  Document editors and WG chairs should
treat these comments just like any other last call comments.

This document includes two YANG modules:
 - ietf-cwt-voucher@2018-02-07.yang
 - ietf-cwt-voucher-request@2018-02-07.yang

These are relatively small modules consisting of a single grouping each, and
are used to augment single leafs into a grouping from an external module
(ietf-voucher).

A couple of nits:
- The modules use the 'cwt' acronym in their names, but that acronym is only
spelled out in the Normative References section. Suggest spelling it out in the
description field in the modules and in the draft itself. - Both modules have
the same top-level description. Suggest revising the wording to describe the
specific content of each module such that they are unique. - I would suggest
running both modules through 'pyang -f yang' for consistent formatting. The
diffs are related to whitespace, quotations and comments (including a modename
in each module) - Sections 6.2.1. and 6.3.1. both provide YANG tree diagrams of
the groupings defined. These groupings are defined in RFC8366 and only one of
the leafs are defined in the local document. It might be worth pointing this
fact out for clarity.