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Comments for Document: Open Cloud Computing Interface - Core and Models
Author(s):A. Edmonds, S. Johnston, T. Metsch, G. Mazzaferro
Public Comment End:22 Mar, 2010

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Posted by: patrickgrant 2010-02-15 10:46:28Much improved since Chgset: 49 - September 29, 2009
As part of a project working with R2AD, I attempted a Java-based, webapp implementation using an earlier OCCI Specification draft (Chgset: 49 - September 29, 2009). During this earlier implementation attempt, I found the documentation to be unclear and inconsistent, mainly due to the intermingling documentation of machine and human interfaces, and to the absence of documentation (example request/response process flows).

This later documentation is much improved and I found it to be clearer in regards to when and how different interfaces can be used. The example requests and responses, combined with the added "Tips" sections, provided a solid set of instructions for implementers/app developers.

My only recommendation for improvement would be to add diagrams and/or example screen shots (of human interfaces). For example, UML sequence and/or activity diagrams, for both a human and machine interface, we provide added clarity and differentiation.

I think this current document provides a strong foundation for implementers/app developers.

Posted by: malishahi 2010-02-15 15:09:13occi core
Here are my comments on reviewing OCCI Core specification and model
Page1: in abstract section: extensbible has a spelling error.

Posted by: garymazz 2010-03-05 02:09:38Collections
In this specification occi resources and attributes can be organized into a collection.

RDF/RDFa can representation a collection "content model" for occi properties and attributes either by explicate predicate relationships, predicate chaining or the definition of a collection element with explicate predicates as relationships. RDF/RDFa though chaining representations also "can" permit the definition of implicate relationships though element chaining.

XML has similar capabilities to organize occi information. Relationships including collections can be represented explicitly though the use of an explicate collection element, other elements and attributes or implicitly thought the definition of a hierarchical occi scheme.

The current definition of a collection does not imply or impose a specific scheme. Neither does it define elements and attribute to support a scheme. This specification does provide a definition for a link to a scheme definition. However, without definition of a scheme or a scheme definition specification interoperability of collection will be difficult to achieve and more difficult to administer.

This specification should include a recommendation, if not a definition, of three collection schemes, 1) an unordered list, 2) an ordered list, and 3) a directed graph. Each should define optional relationships to be considered for implementations.

The Collection has an attribute call "label". Reusing the common attributes' "title" attribute instead of the new "label" attribute should be considered.

Each Collection should contain the common attributes' "id" attribute to aid with the provider based unique identifier for the collection, the practice used for occi resources.

Posted by: jens 2010-03-22 09:10:44General comments
Overall, the document is well written and readable. Definitely a useful document. It suffers somewhat from using concepts before they are defined, eg Category is not defined till 1.4.2. It would be nice to have an overview, ideally a (UML) diagram early in the document, displaying the relationship.

I note that RFC 2119 words seem to be used, would it not be better to use them in the "standard" format and to refer to RFC 2119.

Is not the "Link:" header field deprecated, being defined in RFC 2068 but not RFC 2616.

1.2.2 is slightly confusing in that it refers to a GET on /, yet the example shows a GET on /-/ which is not explained till 1.4. It would be helpful to show the result of the category search first (one result of which presumably would be "compute" and the second search is then performed - see Example 3)

Section 1.3.2 mentions that there is a peer review process for adding new standard actions, but provides no reference to it.

The Tips are quite useful, although they aren't always tips but more like explanatory notes. Maybe the tips that are notes should be called notes.

In example 3 (p. 9), how is the URL /-/compute/us-west to be understood - the previous query returned "compute" and "us-west" (but in different schemes) - are the categories combined, and if so, what happens to the scheme.

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