Re: [Cbor] 🔔 WGLC with request for reviews on cbor-cddl-control-03

Henk Birkholz <henk.birkholz@sit.fraunhofer.de> Wed, 14 July 2021 11:27 UTC

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From: Henk Birkholz <henk.birkholz@sit.fraunhofer.de>
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Subject: Re: [Cbor] =?utf-8?q?=F0=9F=94=94_WGLC_with_request_for_reviews_on_c?= =?utf-8?q?bor-cddl-control-03?=
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Hi list,
hi Cristian,

now that past Henk has survived the cut-off, here is my review for 
cddl-control. I am way behind with all kind of review tasks, but as this 
has the most delay, this was first :-) Please find below the 
corresponding review. I think this memo is in an appropriate state to 
progress.

Viele Grüße,

Henk


I-D.ietf-cbor-cddl-control adds control operators to the CDDL via its 
intrinsic extension mechanism. The proposed additional controls have 
been discussed on the list and in several meetings and are deemed useful 
and appropriately framed.

While .plus, .cat and .det are pretty straight forward, .abnf and 
.feature are a bit more complex and therefore take up the majority of 
the body of the text.

The document is structured well and comes with excellent readability. 
The table up-front provides a concise overview and is providing the 
basis for the following expositional text and IANA Considerations. Table 
1 also indicates two variants of ABNF encoding that is supported. That 
simply could have been included in earlier text as .det is also listed 
next to .cat, but that is not a really a problem for the reader.

Numeric Addition is really helpful when curating interoperability with 
TLV'ish representations of data as these really often work with offsets. 
The example in Figure 1 is intuitive and works fine for me.

String Concatenation is pretty straight forward and hints at tiny 
implementation challenges that can be taken on with a bit of care.

The example for Dedenting concatenation of strings is the most important 
part for the implementer. It works well again and is intuitive. .det is 
an okay name. I would have also really been okay with .dedcat.

.det already prepares the reader for the embedded ABNF control .abnf. As 
some of the implication for implementers are not trivial, this section 
provides a chunk load of context info and details the issues. .abnfb is 
a bit hidden in the section, but as it is listed in the table up-front 
that is effectively not a problem.

NIT: It is highlighted in Section 2.3 how .det is useful to .abnfb, yet 
in Section 3 the context in the itemized list only illustrates .cat in 
the expositional text. The example shows how this all comes together, 
though, using quite intuitive type names. Maybe quickly reiterate the 
purpose of .det here in the text before the example so implementers that 
are looking that up finds all they need in the text itself.

Feature is written relatively abstract and was the hardest for me to 
find intuitive. The examples also take a bit more thinking. Feature is 
relative abstract by intent. As I would not know how to frame it better, 
this is a good solution.

NIT: To simplify the layout of the map in Figure 5, maybe a consistent 
use of "=>" instead of mixing ":" and "=>" might be easier for readers? 
Maybe it is okay to show that they can be mixed here, but might cause 
more confusion than necessary

NIT: I am not a huge fan of "remains to be seen" conjecture in RFC text, 
but well, it's true, so it is probably useful to readers.




On 01.06.21 20:34, Christian Amsüss wrote:
> Hello CBOR group,
> 
> this mail marks the start of a two week WGLC on cddl-control[1].
> 
> As this document has seen no recent review activity, I urge all
> prospective users to read the current version and provide reviews.
> 
> Without positive reviews, this WGLC can not complete.
> 
> Best regards,
> Christian
> 
> [1]: https://datatracker.ietf.org/doc/draft-ietf-cbor-cddl-control/
> 
> 
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