Re: [core] [T2TRG] Review of CoRAL
Christian M. Amsüss <christian@amsuess.com> Mon, 05 November 2018 12:01 UTC
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Date: Mon, 05 Nov 2018 13:01:10 +0100
From: "Christian M. Amsüss" <christian@amsuess.com>
To: Klaus Hartke <hartke@projectcool.de>
Cc: "core@ietf.org WG" <core@ietf.org>
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Subject: Re: [core] [T2TRG] Review of CoRAL
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Hello Klaus, (recipients reduced as CoRE indicated interest in adoption) On Sun, Nov 04, 2018 at 03:56:28PM +0100, Klaus Hartke wrote: > > * How are compressed URIs expressed in CBOR? Flat [6, "foo", 6, "bar"] > > or nested [[6, "foo"], [6, "bar"]]? > > should be flat: [6, "foo", 6, "bar"]. Very well (saves ~10% message size in the 6690 example), now fixed in micrurus. > If it improves clarity, the Python code could be updated to operate > on flat lists instead. The grouper version is probably more concise than the note that "the Python code expects base and href not to be input in the trivial deserialization of a CBOR array, but as a list of (option number, option value) pairs" that should otherwise be there. > body.py: > > if ':' in i.relation: > > rel = i.relation > > else: > > rel = 'http://www.iana.org/assignments/relation/' + i.relation > > When a relation is provided as a string, the intention is that the > string always contains the IRI. I don't think the current set of > IANA-registered link relation types is relevant enough in the context > of IoT that it should get special treatment. Indeed. I don't know where the mistake came from -- my mental model after my current reading of the document was yours, just my the code and example from March did not match it. > body.py: > > elif isinstance(i, BaseDirective): > > base = base / i.iri > > The draft currently specifies that a base IRI is resolved against the > current context IRI, not the previous base IRI. Thanks; likewise, I missed updating the current relation number. Both being fixed. > > * Is there a difference between a CoRAL registry and a CoRAL profile? > > Both terms are used. > > The draft uses the "profile" media type parameter defined in > <https://tools.ietf.org/html/rfc6906> to indicate the CoAL registry, > which I think makes more sense to define a new "registry" parameter > with essentially the same semantics. So "profile" should appear only > as the parameter name. I've replaced all instances where "profile" > appeared without this meaning with "registry". Having read up on them, a "profile" has a no-changes-to-interpretation condition: A profile MUST NOT change the semantics of the resource representation when processed without profile knowledge, so that clients both with and without knowledge of a profiled resource can safely use the same representation Given that a client without knowledge of the profile can't process a representation, the parameter should probably be called something else. > In general, I think URNs would make more sense for identifiers than > HTTP URIs, as the latter always look like they could be successfully > dereferenced. But it seems that HTTP URIs are more popular in the > Semantic Web... It's a matter of style; my take: Devices that dereference URIs on a whim will cause trouble in some form anyway, better let that show on expected input and not only when under attack. And as a developer, I'd rather have a link to follow than know where to look up values in subregistries. Thanks Christian -- To use raw power is to make yourself infinitely vulnerable to greater powers. -- Bene Gesserit axiom
- [core] Review of CoRAL Christian Amsüss
- Re: [core] [T2TRG] Review of CoRAL Klaus Hartke
- Re: [core] [T2TRG] Review of CoRAL Klaus Hartke
- Re: [core] [T2TRG] Review of CoRAL Christian M. Amsüss
- Re: [core] [T2TRG] Review of CoRAL Klaus Hartke
- Re: [core] Review of CoRAL Christian Amsüss
- [core] Possible and impossible CIRIs (was: Review… Christian Amsüss
- Re: [core] [T2TRG] Review of CoRAL Klaus Hartke
- Re: [core] [T2TRG] Review of CoRAL Christian M. Amsüss
- [core] Review of CIRIs (was: Review of CoRAL) Klaus Hartke
- Re: [core] [T2TRG] Review of CoRAL Klaus Hartke
- Re: [core] [T2TRG] Review of CoRAL Carsten Bormann
- Re: [core] [T2TRG] Review of CoRAL Frank MATTHIAS KOVATSCH