[occi-wg] Updates to OCCI core

[alexander.papaspyrou at tu-dortmund.de]

I think we could fix ourselves to the following normative namespaces:

occi.core.* for attributes from the core model
occi.infrastructure.* for attributes from the infrastructure model

and

com.example.* for our examples.

These three MUST NOT be used by third-party extensions; instead, third-party extensions SHOULD follow the reverse-domain-name pattern to prefix their attributes.

Re: simple I would second what Ralf says. Properly implementing a type system is  a non-trivial task.

-A.

Am 14.03.2012 um 09:22 schrieb Ralf Nyren:

> 
> On Sun, 11 Mar 2012 18:35:51 +0000, "Feldhaus, Florian"
> <florian.feldhaus at gwdg.de> wrote:
>> Here are some ideas for extending the description of attributes. To more
>> clearly specify attributes, a new new class 'attribute' should be added
> to
>> OCCI Core. For the class diagram this would require to remove '+
> attributes
>> :Set<String>' from category and instead connect it with the attribute
> class
>> in a many to one dependency.
> 
> We actually had an Attribute class for I while and I guess it is time to
> re-introduce it.
> 
> However, we MUST NOT call it "Attribute". First we already have like 5 or
> so different things we call "attribute" currently and adding another
> "thing" with the same name is just too much. OCCI Core is hard enough to
> read as it is already. Secondly, an object of this class is not really an
> attribute since it has no value. It is a type definition of an attribute, a
> meta-attribute :D
> 
> But given a proper name which is not too confusing this is all great.
> 
>> Ideas for the attribute class:
>> - the attribute class should consist of the attributes: mutable,
> required,
>> type, default
> 
> hehe, attribute class with attributes... you see why we need another name?
> ;)
> 
>> - the naming of attributes of the OCCI specification MUST start with
> occi
>> followed by term and the attribute name (e.g. occi.compute.cores)
> 
> No, this is too restrictive. Remember that each scheme is a separate
> namespace. What we could do is say that attribute name must end with
> .term.attrname, e.g. occi.[xxx.]<term>.<attr>.
> 
>> - the naming of attributes of user defined mixins MUST start with the
>> reversed domain name of the mixin scheme followed by the term and the
>> attribute name (e.g. com.example.my_mixin.my_attribute)
> 
> See above, same applies here.
> 
>> - the attribute type should contain restrictions on the attribute like
> for
>> example:
>> * string: choices, min_length, max_length
>> * number: bounds (one or more lower and upper bounds)
>> - there might be more detailed attribute types such as URL or URI,
> float,
>> integer, ...
> 
> This must be detailed out properly. I would rather keep it on the simple
> side though...
> 
> /Ralf
> 
>> 
>> --Florian
>> 
>> 
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-- 
Alexander Papaspyrou
alexander.papaspyrou at tu-dortmund.de

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