[occi-wg] Simple JSON rendering for OCCI

[Edmonds, AndrewX]

Re: The meta-model - and it's related to current model discussions...

This is somewhat incorrect - all providers provide access to their API's over HTTP yet their metamodels are not bound to HTTP in principle. I can send a XML model based on an XML-XSD metamodel over HTTP. I can send that same model over a different transport if I wanted to. The point here is that the model and the optional meta-model are not explicitly bound to the transport.

Sun's models are specified in text [1]. They seem not to use an imported metamodel per say, possibly due to JSON's lack of a mechanism to define schemas (yes there's JSONSchema but not in wide use). In fact Sun's models are very suitable for many of OCCI's needs (as Ben Black noted).

Amazon's [2] as embedded XSD in the WSDL based on W3C XSD (its meta model). All have models, some have metamodels and all are not inherently bound to a particular transport, just a default, prior-agreed one.

Other than that I agree with keeping dependencies to a minimum, like you describe.

Andy

[1] http://kenai.com/projects/suncloudapis/pages/CloudAPISpecificationResourceModels
[2] http://soap.amazon.com/schemas2/AmazonWebServices.wsdl

-----Original Message-----
From: occi-wg-bounces at ogf.org [mailto:occi-wg-bounces at ogf.org] On Behalf Of Richard Davies
Sent: 12 May 2009 15:19
To: occi-wg at ogf.org
Subject: Re: [occi-wg] Simple JSON rendering for OCCI

> > pull in tens of thousands of lines of library code...
>
> Nobody's forcing you to pull in any more code for one rendering than
> another - the Google GData clients have code for working with all of their
> 16 services and are Apache licensed

As I said this morning, GData libraries do exist for many platforms, but are
not universal, and do run to tens of thousands of lines of code.

I'm worried having a library of this size as a key dependency for OCCI when
we could go with a much lighter meta-model (in either JSON or XML) and not
require the library.

All existing cloud APIs (Amazon, Sun, GoGrid, ElasticHosts, etc.) have
specified their APIs directly over HTTP rather than over a pre-existing meta
model.

Should we really be pulling in a dependency which is this large when we have
a clear choice not to?

Richard.
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