W3C home > Mailing lists > Public > public-webpayments@w3.org > March 2013

Re: PaySwarm Alpha 6 Released

From: Melvin Carvalho <melvincarvalho@gmail.com>
Date: Sun, 3 Mar 2013 18:21:20 +0100
Message-ID: <CAKaEYhKQvs=Dpa1OaF7ZeXPfDcNoCkE2ad8qH+26XrJPu8rXFg@mail.gmail.com>
To: Manu Sporny <msporny@digitalbazaar.com>
Cc: Web Payments <public-webpayments@w3.org>
On 3 March 2013 15:31, Manu Sporny <msporny@digitalbazaar.com> wrote:

> On 03/03/2013 09:02 AM, Melvin Carvalho wrote:
> > 1. I presume hash based currencies will be supported, I use the
> > 'facebook' style of https://w3id.org/currencies/USD#
> > <https://w3id.org/currencies/USD> (note the trailing hash) this is
> > to distinguish the document from the currency and also future proof
> > allowing extra subjects to reside in that document.
>
> Yes, hashes in currencies are just fine. So, this is perfectly valid:
>
> http://example.org/myapp#credits
>

Great!


>
> PaySwarm treats the identifier opaquely, but expects Currency Mint
> endpoint information to exist at the currency URL (such as where do I go
> to get new units of this currency).
>
> As far as distinguishing the Document from the currency, we're delving
> into HTTP Range-14 territory, but we never really liked the solution
> proposed by the TAG for that. Our interpretation of URLs on the Web can
> be summarized like this:
>
> You don't know if a URL is for a document or a resource of another
> nature (like a currency) until you dereference the URL. Once you get a
> representation, check the representation to find out the "rdf:type".
> This avoids all the crazy 30x redirection that HTTP Range 14 requires
> and is a fairly straight-forward way of figuring out what a resource on
> the Web is. One could go a step further and do one of two things:
>
> 1. If a resource doesn't have an rdf:type on the Web, you can assume
>    it's a document, or
> 2. If a resource doesn't have an rdf:type on the Web, you can't
>    assume anything about its type other than by inference.
>
> ... leaning more toward the latter than the former.
>

I've seen this approach before, but I'm unsure of the benefits.  My
understanding was that there's not going to be a major change in Web Arch
anytime soon, so I try to "play it safe" by not trying to second guess
which direction it will go.

Without wishing to go off-topic, would love to hear if there are any
compelling reasons or this design decision.

But so long as I'll not be breaking payswarm interop by adding the #,
that's great.


>
> > 2. I'm interested in how to model a current or new currency, first
> > question is what is @type?
>
> We'll add a new class to the Commerce Vocabulary for "Currency". So, the
> full URL for the type would be:
>
> https://w3id.org/commerce#Currency
>
> -- manu
>
> --
> Manu Sporny (skype: msporny, twitter: manusporny, G+: +Manu Sporny)
> Founder/CEO - Digital Bazaar, Inc.
> blog: Aaron Swartz, PaySwarm, and Academic Journals
> http://manu.sporny.org/2013/payswarm-journals/
>
>
Received on Sunday, 3 March 2013 17:21:49 UTC

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