JSON-LD (Was:Re: Vaccination Certificate Test Suite)

Hi,
I will begin by apologizing for the dump questions, but I still haven't completely understood JSON-LD. I have two questions regarding https://w3c-ccg.github.io/vaccination-vocab/context/v1/index.json

1) What is the purpose of lines 7-10, i.e.,
        "description": "http://schema.org/description",
        "identifier": "http://schema.org/identifier",
        "name": "http://schema.org/name",
        "image": "http://schema.org/image"
and why these attributes are redefined inside VaccinationCertificate attribute (lines 18-21)?

2)  In various places there is the following line
"@type": "http://www.w3.org/2001/XMLSchema#dateTime"

Firstly, I thought that the @type property would lead to something machine readable so that type checks are automated. Even if this is not the case, http://www.w3.org/2001/XMLSchema#dateTime contains no information about this type. Is there any implicit agreement that this URL corresponds to a "date"? The closest I found by following links was that 
https://www.w3.org/TR/xmlschema11-2/#dateTime

But even this, it says: "dateTime uses the date/timeSevenPropertyModel, with no properties except timezoneOffset permitted to be absent." Hence **if** this is the correct type, all the examples are not correct since they do not include the time part, in the `birthDate` attribute which is of that type. 

Best,
Nikos
--
Nikos Fotiou - http://pages.cs.aueb.gr/~fotiou
Researcher - Mobile Multimedia Laboratory
Athens University of Economics and Business
https://mm.aueb.gr

> On 25 Apr 2021, at 7:13 PM, Manu Sporny <msporny@digitalbazaar.com> wrote:
> 
> TL;DR: A new W3C CCG Capability has been created to  generate weekly NxN
> interoperability test reports for W3C  Verifiable Credential Vocabularies. The
> Vaccination  Certificate Vocabulary is the first test report to benefit  from
> this new capability. An example of the test suite output can be viewed here:
> 
> https://w3id.org/vaccination/interop-reports#Polio
> 
> On 4/8/21 1:29 PM, Manu Sporny wrote:
>> You can view the latest Vaccination Certificate test suite report here:
>> 
>> https://w3id.org/vaccination/interop-reports
> 
> With a huge thanks to Andrew Jones, a new release of the Vaccination
> Certificate test suite has been released:
> 
> https://github.com/digitalbazaar/vaccination-certificate-test-suite/
> 
> Improvements include:
> 
> 1. A weekly continuous-integration / continuous-testing
>   automation that tests all known VC HTTP API issuers
>   against all known VC HTTP API verifiers that are
>   passing the test suite. PRs welcome to add other
>   issuers or verifiers. You can see the latest run
>   here:
> 
> https://github.com/digitalbazaar/vaccination-certificate-test-suite/runs/2429248801?check_suite_focus=true#step:9:675
> 
> 2. An option to manually trigger a complete test run
>   and upload the latest report to the interoperability
>   reports website.
> 
> 3. Use of the 2020 Ed25519 cryptosuite to provide
>   compression-friendly input to CBOR-LD:
> 
> https://w3id.org/vaccination/interop-reports#Polio
> 
> 4. Use of the new base32 encoding to alphanumeric QR Codes
>   (ensures QR Codes can be read by a large portion of QR
>   Code reader devices):
> 
> https://w3id.org/vaccination/interop-reports#Polio
> 
> 5. Linkability to examples so that people can link to,
>   and have a good understanding of, what each payload
>   looks like:
> 
> https://w3id.org/vaccination/interop-reports#example-4-polio-vaccination-certificate
> 
> 6. A generalized mocha reporter that is optimized for
>   showing an interop compatibility matrix, which is
>   useful during the W3C Candidate Recommendation phase
>   (to demonstrate NxN interoperability status for
>   various implementations):
> 
> https://github.com/digitalbazaar/mocha-w3c-interop-reporter
> 
> The latest full test report is available here:
> 
> https://w3id.org/vaccination/interop-reports
> 
> -- manu
> 
> -- 
> Manu Sporny - https://www.linkedin.com/in/manusporny/
> Founder/CEO - Digital Bazaar, Inc.
> blog: Veres One Decentralized Identifier Blockchain Launches
> https://tinyurl.com/veres-one-launches
> 
>