Re: Derived Attributes

David,

Thanks. I saw an attribute predicate in an animation (I thought is was a derived attribute); I'm reading about attributes and predicates.

For the example, it might make sense for an issuer to issue electoral districts onto a credential, if we desire the capability for anonymous feedback to elected officials and if the elected officials desire to know that a feedback-provider is from an electoral district.


Best regards,
Adam

From: David Chadwick<mailto:D.W.Chadwick@kent.ac.uk>
Sent: ‎Wednesday‎, ‎August‎ ‎23‎, ‎2017 ‎5‎:‎43‎ ‎AM
To: public-credentials@w3.org<mailto:public-credentials@w3.org>

Hi Adam

since credentials are signed by issuers, then I do not believe a
repository can implement a derived attribute, as a repository is not
usually a trusted issuer. I suggest the issuer will issue this if
requested to by the subject.

regards

David

On 22/08/2017 21:51, Adam Sobieski wrote:
> Credentials Community Group,
>
> I would like to ask about /derived attributes/ (e.g. over 21 which is
> derived from birthdate and the current date), about how they are
> implemented by credential repositories towards understanding whether
> more complex derived attributes such as electoral districts might be
> possible.
>
> Electoral districts (https://en.wikipedia.org/wiki/Electoral_district)
> are dynamic regions. A digital wallet might inquire to a remote service
> about how an address or location maps to an electoral district (e.g.
> https://developers.google.com/civic-information/)
>
> Cities, states and electoral districts could be useful for government
> feedback forms, recording audio messages for or writing letters to
> Congresspeople via websites.
>
>
> Best regards,
> Adam Sobieski