[occi-wg] Regarding Mixin relation and "accumulation" of attributes

[Ralf Nyren]

On Mon, 7 May 2012 13:45:45 +0200, Andy Edmonds <andy at edmonds.be> wrote:
> Ok this reflects what I had understood, I hope! :p
> 
> The case that my question arose out of was the following:
> 
>  - user creates a user defined mixin (UDM), which is used later to group
> resources.
>  - the formulation of the UDM mixin includes a related mixin (a security
> group mixin).
>  - when the request is received by the server side the fact that there
is a
> rel value signals that additional processing may be required (in this
case,
> yes) to satisfy the completion of the request.

Yes, that is the way I would interpret it as well. A rel would cause the
server to check if the client is allowed to create a Mixin with the
requested relation.

A "rel" pointing to a Kind would cause a Bad Request for example.

regards, Ralf

> 
> Andy
> andy.edmonds.be
> 
> 
> On Mon, Apr 23, 2012 at 16:57, Ralf Nyren <ralf at nyren.net> wrote:
> 
>>
>> Andy, you asked about whether a Mixin related to another Mixin will
>> inherit the attributes.
>>
>> Please look at OCCI Core page 9:
>>
>> "Mixin Relationships A Mixin instance MAY be related to another Mixin
>> instance for type classification
>> purposes. For example a set of operating system templates, implemented
as
>> Mixin instances, could be related
>> to an “OS-template” Mixin in order to help identification.
>>
>> Attributes and Actions defined by different Mixin instances are
combined
>> when Mixin relationships are present.
>> ^^^^^^^^^^^
>>
>> Therefore a resource instance associated with a particular Mixin will
>> receive the additional capabilities defined
>> by any related Mixin instances as well as those defined by the Mixin
>> associated."
>>
>> Does this cover what you were after? Maybe it is unclear that
>> "capabilities" refer to attributes as well?
>>
>> regards, Ralf
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