Ralf, Am 13.08.2010 um 11:59 schrieb Ralf Lyren:
Each category, defined by schema + term, can have a set of associated attributes. What namespace restrictions/rules are imposed on these attributes? Currently Core&Models says provider defined categories must be in a different namespace but no more. Maybe extend this a bit further as to avoid namespace conflicts while combining many categories? I believe earlier revs of the spec said something like: com.example.<category_term>.<attr_name>
I don't recall that this ever has been discussed, but it certainly is a very good idea.
I do not quite understand the various Content-type headers used in the examples. Are they of any significance to the definition/use of categories?
No. They are just supposed to make it easier to spot the type within the core model. So, the MIME types would be something like application/occi-resource (for the Resource class from core) application/occi-link (for the Link class from core) ... (whatever else is defined as a class in core) That way, you don't have to analyze the details of a REST resource, but just look at the MIME type delivered by the OCCI container.
And just a few notes on the examples, sorry if it sounds picky but consistency really helps understanding:
- Category: compute; scheme="http://prov.com/occi#"; Scheme should be "http://prov.com/occi/resource#" right?
The URIs we used just served as example. For a category with term "foo" and scheme "bar", you would have Category: foo; scheme="bar";
- Link: </compute/123-123-123;start>; type="application/occi-action"; Is the "type" attribute of the Link header something new? If so, how it is defined?
We have been discussing yesterday whether the type attribute is necessary at all. Probably this has not found its way into the Wiki.
- In Link header: rel="category http://prov.com/occi#action" Is the format rel="category XXX" something new as well?
Yes. We tried to stick as much as possible to the IETF nottingham Link draft [1], not adding any additional vendor-specific extensions. HTH. Best, Alexander [1] http://tools.ietf.org/html/draft-nottingham-http-link-header-04
On Fri, 13 Aug 2010 11:10:18 +0200, Edmonds, AndrewX <andrewx.edmonds@intel.com> wrote:
Hi all, Yesterday Alexander and I spent some time exploring and discussing OCCI categories. These categories make up the type system for OCCI and I've documented our discussion here [1]. We'd love to hear feedback, comments etc!
Andy
[1] http://forge.gridforum.org/sf/wiki/do/viewPage/projects.occi-wg/wiki/Categor...
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