[oslc-core] REMINDER: OSLC Core WG meeting tomorrow 10am US/ET

Fri Sep 17 13:05:32 EDT 2010

On Fri, Sep 17, 2010 at 11:48 AM, Arthur Ryman <ryman at ca.ibm.com> wrote:
> Thx for improving the example. But now I find myself asking another
> question. Why are we using magazine subscriptions?

Because, at the time we came up with the examples, we did not have
real domain examples yet.

> This example looks technically correct, but it looks very contrived. If I
> was designing a data model that involved magazine subscriptions, I would
> certainly make a Subscription a first-class resource, and I would define
> all the usual properties on it. In this example, somehow we have elevated
> the subscribesTo property to a higher importance than the subscription
> itself, and we have in effect turned the reified Statement into a
> substitute for a Subscription resource. In practice, I would use a
> hasSubscription property to relate the Customer to a Subscription.

We don't really provide guidance on how you decide whether to model a
relationship as an intermediate resource or as a link with property
values. Perhaps you must do this on a case-by-case basis but what is
the thought process? I assume it is based on use cases and attempting
to understand the queries needed to support those use cases.

> I think an example should be more than technically correct. It should also
> show how a technique is motivated in practice. I have to believe that
> there is a more compelling example for the introduction of link
> properties. We need a real-world, OSLC domain example where it becomes
> natural to add properties to the link. If we can't find a convincing
> example, perhaps this link guidance is not needed.

I believe we have some real examples now and perhaps we should
consider adding them to later editions of this guidance.

Thanks,
Dave

>
> Regards,
> ___________________________________________________________________________
>
> Arthur Ryman, PhD, DE
>
> Chief Architect, Project and Portfolio Management
> IBM Software, Rational
> Markham, ON, Canada | Office: 905-413-3077, Cell: 416-939-5063
>
>
>
>
>
> From:
> Dave <snoopdave at gmail.com>
> To:
> oslc-core <oslc-core at open-services.net>
> Date:
> 09/16/2010 12:58 PM
> Subject:
> Re: [oslc-core] REMINDER: OSLC Core WG meeting tomorrow 10am US/ET
> Sent by:
> oslc-core-bounces at open-services.net
>
>
>
> Thanks, Jim. That looks much better. I just made the fixes you suggested
> in the link guidance.
>
> re: formatting dates, I think we should handle that in the Representation
> Guidance, which perhaps we need to formally finalize as well.
>
> - Dave
>
>
>
> On Wed, Sep 15, 2010 at 2:03 PM, James Conallen <jconallen at us.ibm.com>
> wrote:
> Some quick comments. I think Example #2 should be simplified with:
> <rdf:RDF
> xmlns:terms="http://example.com/terms/"
> xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#">
>
> <terms:Customer rdf:about="http://example.com/customers/4321">
> <terms:subscribesTo rdf:resource="
> http://example.com/magazines/Field_and_Stream" />
> </terms:Customer>
>
> <terms:Customer rdf:about="http://example.com/customers/4321">
> <terms:subscribesTo rdf:resource="http://example.com/magazines/Cat_Fancy"
> />
> </terms:Customer>
>
> <rdf:Statement rdf:about="">
> <terms:expirationDate>2010-06-03</terms:expirationDate>
> <terms:annualPriceUSD>23.95</terms:annualPriceUSD>
> <rdf:subject rdf:resource="http://example.com/customers/4321"/>
> <terms:delivery rdf:resource="http://example.com/terms/online" />
> <rdf:subject rdf:resource="http://example.com/customers/4321"/>
> <rdf:object rdf:resource="http://example.com/magazines/Field_and_Stream"/>
> <rdf:predicate rdf:resource="http://example.com/terms/subscribesTo" />
> </rdf:Statement>
>
> <rdf:Statement rdf:about="">
> <terms:expirationDate>2010-01-22</terms:expirationDate>
> <terms:annualPriceUSD>15.95</terms:annualPriceUSD>
> <terms:delivery rdf:resource="http://example.com/terms/mail" />
> <rdf:subject rdf:resource="http://example.com/customers/4321"/>
> <rdf:object rdf:resource="http://example.com/magazines/Cat_Fancy"/>
> <rdf:predicate rdf:resource="http://example.com/terms/subscribesTo" />
> </rdf:Statement>
>
> </rdf:RDF>
>
> Note I corrected the small typo (copy-paste error) with the actual values
> for the expiration date and annual price for the Cat Fancy link. Also to
> be consistent with the JSON version I corrected the delivery value.
>
> I think you'll also want to correct in Example #3 the delivery method for
> the cat fancy link to mail (to be consistent with JSON representation).
>
> Finally looking at this example, especially with the JSON format, have we
> given any consideration to formatting dates. For example is the first date
> June 3rd, or March 6th? In RDF formats we can specify the datetime format
> explicitly (i.e. ^^xsd:dateTime ). Not sure about JSON.
>
> <jim/>
>
> jim conallen
> CAM Lead Architect
> jconallen at us.ibm.com
> Rational Software, IBM Software Group
>
>
>
> Dave ---09/15/2010 01:48:38 PM---Minutes have been posted here:
> http://open-services.net/bin/view/Main/OslcCoreMeetings20100915
>
> From: Dave <snoopdave at gmail.com>
> To: oslc-core <oslc-core at open-services.net>
> Date: 09/15/2010 01:48 PM
> Subject: Re: [oslc-core] REMINDER: OSLC Core WG meeting tomorrow 10am
> US/ET
> Sent by: oslc-core-bounces at open-services.net
>
>
>
>
> Minutes have been posted here:
>  http://open-services.net/bin/view/Main/OslcCoreMeetings20100915
>
> As always, feedback is most welcome.
>
> Thanks,
> Dave
>
>
> On Tue, Sep 14, 2010 at 8:56 PM, Dave <snoopdave at gmail.com> wrote:
>> We will have a Core WG meeting tomorrow Wednesday September 15 at 10AM
>> US/ET. Here's the info:
>>
>> Agenda:
>>  http://open-services.net/bin/view/Main/OslcCoreMeetings20100915
>>
>> If you have additional agenda items, please speak up.
>>
>> Telecon:
>>  * Participant passcode: 558663
>>  * Toll free: 1-866-423-8350
>>  * Toll: 1-719-387-8273
>>
>> Online meeting:
>>  * For people outside IBM
>>    https://www.lotuslive.com/join?schedid=4446009
>>  * For IBM employees
>>    https://wedc.lotus.com/meeting/join/?schedid=4446009
>
>>    (IBM intranet authentication required)
>>
>> Thanks,
>> Dave
>>
>
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