[occi-wg] Fwd: Re: XML for OCCI

[Jean Parpaillon]

Sharing this discussion on XML rendering...


-------- Message original --------
Sujet: 	Re: XML for OCCI
Date : 	Tue, 24 Sep 2013 11:03:22 +0200
De : 	Augusto Ciuffoletti <augusto.ciuffoletti at gmail.com>
Pour : 	Jean Parpaillon <jean.parpaillon at free.fr>



You can certainly share with the group. I'm elaborating an answer, that
I'll post to the group.


2013/9/24 Jean Parpaillon <jean.parpaillon at free.fr
<mailto:jean.parpaillon at free.fr>>

    Hi Augusto,

    Le 24/09/2013 10:06, Augusto Ciuffoletti a écrit :
    > Jean,
    >
    > sorry for not being at your presentation: I concentrated on the OGF
    > session, and I did not consider other good reasons to participate.
    >

    No harm: I'm really interested in contributing to OCCI specifications
    and I have no doubt we have another occasion to meet !

    On my side, I have seen your spec about monitoring I consider a really
    important topic but I am now more focusing on core and renderings parts.


    > I always started from the assumption that the "true" rendering was
    HTML,
    > which is definitely not a simplifying assumption. The JSON and XML
    > renderings open entirely new horizons.
    >
    > I submit you two problems I have with the monitoring API:
    >
    > -) one is subtyping mixins, binding their semantic (not simply their
    > syntax): this is done by introducing tagging mixins, and then saying
    > that a mixin related with a certain tag must have "certain" attributes
    >

    Mixin can also have their own attributes, isn't it enough ? Can you give
    me an example ? I must admit mixin is a concept I'm not really
    confortable with. I consider they should be use to add attributes to a
    resource when is does not make sense to have a separate id for it, but I
    may be wrong.

    > -) the other is describing such "certain" attributes: their value is
    > used to establish a relationship with complementary attributes in
    > another entity, which is the desired "semantic" (like a "port_number"
    > attribute)

    Ok, this is a problem not specific to mixins, IMO. Attributes typing in
    general should be more advanced in OCCI and, in particular, an attribute
    could be an OCCI type.
    My proposal does not handle yet this complex type, even if think it is
    necessary to handle it. As a quick draft of proposal, I think the
    following should work:

    <occi:kind term="manifest" scheme="http://example.org/myschemas#" >
      <occi:rel term="resource"
    scheme="http://schemas.ogf.org/occi/infrastructure#" />
      <occi:attribute name="nodes" type="occi:entityAttr" minOccurs="0"
    maxOccurs="unbounded" >
        <occi:rel term="compute"
    scheme="http://schemas.ogf.org/infrastructure#" />
      </occi:attribute>
    </occi:kind>


    .. my proposal is missing the definition of "entityAttr", which
    would be:
    <xs:complexType name="entityAttr" >
     <xs:sequence>
      <xs:element name="rel" type="occi:relatedType" />
     </xs:sequence>
    </xs:complexType>

    We could then validate the following resource:

    <occi:resource id="...." >
      <occi:kind term="manifest" scheme="http://example.org/myschemas#" />
      <occi:attribute name="nodes >
        <occi:value>/path/to/compute/resource</occi:value>
        <occi:value>/path/to/another/compute/resource</occi:value>
      </occi:attribute>
    </occi:resource>

    Of course, this would imply some code to implement it (it is not pure
    XSD), but the information is there.

    >
    > I see no way to introduce this in an xml schema, but I've never tried
    > to. In these days, I'm thinking to RDF. Any opinion about this?
    >

    I have never used RDF.
    Anyway, thank for the occasion to provide concrete example of complex
    attributes.
    Do you mind I forward this to occi-wg list for comments ?


    Best regards,
    Jean

    >
    > --
    > Augusto Ciuffoletti
    > Via Milano 118
    > 38122 - Trento


    --
    Jean Parpaillon
    Open Source Consultant
    Phone: +33 6 30 10 92 86 <tel:%2B33%206%2030%2010%2092%2086>
    im: jean.parpaillon at gmail.com <mailto:jean.parpaillon at gmail.com>
    skype: jean.parpaillon
    linkedin: http://www.linkedin.com/in/jeanparpaillon/en




-- 
Augusto Ciuffoletti
Via Milano 118
38122 - Trento


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