Re: [Cbor] Consolidated set of tags for map-like entities
Emile Cormier <emile.cormier.jr@gmail.com> Tue, 16 March 2021 23:27 UTC
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From: Emile Cormier <emile.cormier.jr@gmail.com>
Date: Tue, 16 Mar 2021 20:27:04 -0300
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To: Kio Smallwood <kio@mothers-arms.co.uk>
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Subject: Re: [Cbor] Consolidated set of tags for map-like entities
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I've updated the GitHub repo with a new section describing how the tags relate to programming language containers. I only have Javascript, Python, and C++ there for now. I'm not fluent in Python and had to consult online documentation. It's entirely possible I got things wrong in the Python subsection. I have the following new thoughts: 1. We should consider adding similar tags for lists of discrete values (not key-value pairs). For example, the homogeneity, ordering, and uniqueness properties could be associated with programming language lists, sets, and multisets. I think this would add eight additional tags, for a total of 20. 2. I'd like to replace the terms "homogenous/heterogeneous" with the terms "uniform/arbitrary" for better readability. On Tue, Mar 16, 2021 at 3:38 PM Emile Cormier <emile.cormier.jr@gmail.com> wrote: > RFC8746 has this to say about homogeneous arrays: > > Which CBOR data items constitute elements of the same application type is >> specific to the application. >> > > I think this interpretation of "homogenous" should be the same for this > proposal. > > On Tue, Mar 16, 2021 at 2:36 PM Emile Cormier <emile.cormier.jr@gmail.com> > wrote: > >> Hi Kio, >> >> I'll add an information section on how the various tags relate to >> programming language data structures. I could start with JS and C++ data >> structures, and allow other folks to send or PR me the ones for other >> languages. >> >> For homogeneous key/values, it was actually my intention that the first >> key/value encountered "establishes" the type for the remainder. A decoder >> could reject a homogenous map where a key/value does not match the type >> established by the first. >> >> You've made me realize that the interpretation for "homogenous" could be >> tricky for numeric types. For example, if the first homogenous key is a >> positive integer, can the decoder assume that the following keys may also >> include negative integers and floats? I'll check what it says for >> homogenous arrays in https://tools.ietf.org/html/rfc8746 . It may have >> already been settled there. >> >> This also begs the question: what does "homogeneous" mean for key/value >> types that are themselves arrays or maps? >> >> Thanks for the feedback! >> Emile >> >> On Mon, Mar 15, 2021 at 4:36 PM Kio Smallwood <kio@mothers-arms.co.uk> >> wrote: >> >>> Hi Emile, >>> >>> Thanks for enumerating all of the possibilities. I have a few thoughts: >>> >>> * Would it be worth noting which programming languages and environments >>> already make use of each type? For example, users of the cbor2 python >>> library would only see tag 128 (equivalent to major type 5) tag 129, 130, >>> for ordered and multimaps, and 132 when inter-operating with >>> javascript/json. The rest would be very strange to encounter in a Python >>> datastructure. >>> >>> * For the Homogeneous keys/values, should we (codec implementers) assume >>> that the type of the first key/value encountered in the data item >>> determines the type of the remainder? >>> >>> Thanks, >>> >>> Kio >>> >>> >>> On 2021-03-12 23:50, Emile Cormier wrote: >>> >>> Hi Everyone, >>> >>> I've been corresponding privately with Prof. Bormann about a new tag I >>> proposed for encoding multimaps as arrays or pairs. He's made me aware of >>> your recent discussion about another proposed tag for encoding "ordered" >>> maps, where the insertion order must be preserved. Carsten has indicated to >>> me his desire to consolidate all of these map-related tags together. >>> >>> I would like to contribute to this endeavor of consolidating map-related >>> tags. To get the discussion started, I would like to share with you a draft >>> proposal I've written to serve as a starting point: >>> https://github.com/ecorm/cbor-map-like >>> >>> Here's a brief summary: >>> >>> >>>> >>>> This document proposes a consolidated set of CBOR tags for map-like >>>> entities involving key-value pairs. These tags encode the following >>>> meta-data concerning map-like entities: >>>> >>>> - the homogeneity of the key and value types, >>>> - the preservation of the insertion order of the key-value pairs, >>>> - the uniqueness of the keys, and, >>>> - the major type used to encode the key-value pairs. >>>> >>>> >>> My interest in CBOR stems from my work on a new C++ serialization >>> library that can support any JSON-like encoding. This library is closed >>> source for now, but I may be able to convince my employer to make it open >>> source in the future. >>> >>> I'm also involved with the WAMP protocol, which allows CBOR as one of >>> its encodings. >>> >>> I'm looking forward to collaborating with you and I hope that we can >>> come to a solution that satisfies everyone's needs. >>> >>> Cheers, >>> Emile Cormier >>> >>> _______________________________________________ >>> CBOR mailing list >>> CBOR@ietf.org >>> https://www.ietf.org/mailman/listinfo/cbor >>> >>> >>>
- [Cbor] Consolidated set of tags for map-like enti… Emile Cormier
- Re: [Cbor] Consolidated set of tags for map-like … Joe Hildebrand
- Re: [Cbor] Consolidated set of tags for map-like … Carsten Bormann
- Re: [Cbor] Consolidated set of tags for map-like … Emile Cormier
- Re: [Cbor] Consolidated set of tags for map-like … Kio Smallwood
- Re: [Cbor] Consolidated set of tags for map-like … Joe Hildebrand
- Re: [Cbor] Consolidated set of tags for map-like … Emile Cormier
- Re: [Cbor] Consolidated set of tags for map-like … Joe Hildebrand
- Re: [Cbor] Consolidated set of tags for map-like … Emile Cormier
- Re: [Cbor] Consolidated set of tags for map-like … Joe Hildebrand
- Re: [Cbor] Consolidated set of tags for map-like … Emile Cormier
- Re: [Cbor] Consolidated set of tags for map-like … Emile Cormier
- Re: [Cbor] Consolidated set of tags for map-like … Emile Cormier
- Re: [Cbor] Consolidated set of tags for map-like … Emile Cormier
- Re: [Cbor] Consolidated set of tags for map-like … Carsten Bormann