RE: Media types

["Tyson, Paul H" <ptyson@bh.com>]

Ray,

OK, thanks for the references to rfc3023. I agree with your proposed types.

However, I don't think this profile is the right place to define a JSON mapping for XACML. That should be a different document.

Regards,
--Paul

> -----Original Message-----
> From: remon.sinnema@emc.com [mailto:remon.sinnema@emc.com]
> Sent: Tuesday, 24 April, 2012 09:15
> To: Tyson, Paul H
> Cc: xacml@lists.oasis-open.org
> Subject: RE: Media types
> 
> Paul,
> 
> 
> > -----Original Message-----
> > From: Tyson, Paul H [mailto:ptyson@bh.com]
> > Sent: Tuesday, April 24, 2012 3:38 PM
> > To: Sinnema, Remon; xacml@lists.oasis-open.org
> > Subject: RE: Media types
> >
> > Following your reasoning that media types are used mainly for content
> > negotiation, why do we even need specialized media types for XACML?
> 
> http://tools.ietf.org/html/rfc3023#page-32
> 
> There could be other XML based formats that represent the same
> information as application/xacml+xml. For instance, a policy could
> potentially also be represented by RDF-XML (application/rdf+xml).
> 
> 
> > The currently defined top-level syntactic entities--Policy,
> PolicySet,
> > Request, Response--will just be "text/xml".
> 
> http://tools.ietf.org/html/rfc3023#section-3
> 
> Anything in the "text" branch is supposed to be readable for a *casual*
> user. That's definitely not the case for XACML, so we need a media type
> from the "application" branch.
> 
> 
> > If we do move forward with an "application/xacml+json" type, I don't
> > think the profile should include examples. The TC has not specified
> any
> > JSON representation of XACML entities, and the examples in this
> profile
> > would be misleading. The profile should state clearly that this media
> > type does not imply any particular mapping from XACML XML syntax to
> > JSON data structures.
> 
> The JSON format needs to be defined somewhere, or else JSON based
> systems can't interoperate. So we have two options:
> (1) We define the JSON representation in this profile
> (2) We create a separate JSON profile and refer to that from here
> 
> I was shooting for (1), with the examples being the "specification" of
> the JSON format.
> 
> Unfortunately, there is no JSON equivalent of XML Schema. I think the
> best we can do is something like this:
> http://amundsen.com/media-types/collection/format/#objects
> 
> 
> Thanks,
> Ray