[occi-wg] Simple JSON rendering for OCCI
andrewx.edmonds at intel.com
Tue May 12 10:02:42 CDT 2009
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 . 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  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.
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
Should we really be pulling in a dependency which is this large when we have
a clear choice not to?
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