[oslc-core] Behavior of oslc.where and oslc.sort if resources are not managed by the service provider

[Dragos Cojocari]

Hey Arthur,


>> You also asked about oslc.orderBy. If you specify sort keys that are 
not 
>> present then the behavior is undefined [3]. The spec recommends that 
you 
>> use single-valued, required properties when sorting.
That clarifies usage. We'll need to make sure we document this for our 
users.

Regards,
        Dragos



Arthur Ryman <ryman at ca.ibm.com> 
12/01/2011 16:18

To
Dragos Cojocari/Romania/IBM at IBMRO
cc
oslc-core at open-services.net, oslc-core-bounces at open-services.net
Subject
Re: [oslc-core] Behavior of oslc.where and oslc.sort if resources are not 
managed by the service provider






Dragos,

I described the formal meaning of queries by giving their equivalent 
expression in SPARQL. See [1].

The meaning of the oslc.where clause is given by translating it into a 
corresponding WHERE clause. The example you give is like Example 2 [2].

SPARQL is based on graph pattern matching, so if a property is absent 
there is no match and the resource won't be included in the result.

You also asked about oslc.orderBy. If you specify sort keys that are not 
present then the behavior is undefined [3]. The spec recommends that you 
use single-valued, required properties when sorting.

[1] http://open-services.net/bin/view/Main/OslcSimpleQuerySparqlV1
[2] 
http://open-services.net/bin/view/Main/OslcSimpleQuerySparqlV1#Example_2_Searching_for_Resource

[3] http://open-services.net/bin/view/Main/OSLCCoreSpecQuery#oslc_orderBy

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:
Dragos Cojocari <dragos.cojocari at ro.ibm.com>
To:
oslc-core at open-services.net
Date:
01/12/2011 08:12 AM
Subject:
[oslc-core] Behavior of oslc.where and oslc.sort if resources are not 
managed by the service provider
Sent by:
oslc-core-bounces at open-services.net



Hey everyone, 

and a Happy new year. 

I'd like to understand what is the defined behaviour if a query specifies 
in its where/orderBy clause and the collection of resources contains 
resources not managed by the service provider and the serviceprovider 
cannot filter/sort them. What should the provider do: 
- reject the response with an error 
- include only the resources for which the filter/sort can be calculated 
- undefined 

Example data: 




So for the data above what is the expected result for the following query: 

 
http://<server>:<post>/defects?oslc.select=*&oslc.where=oslc:shortTitle="Some 

defect" 

Regards, 
        Dragos

Exceptand situatiile in care partile au convenit in alt mod: / Unless 
stated otherwise above:
IBM România S.R.L.
Bucharest Business Park, Corp A2, Şos. Bucureşti-Ploieşti Nr. 1A, 013681
Bucureşti 1, ROMANIA
CIF RO378660, RC J/40/5106/1991
Cap.Soc. 41.670 Lei_______________________________________________
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Exceptand situatiile in care partile au convenit in alt mod: / Unless 
stated otherwise above:
IBM România S.R.L.
Bucharest Business Park, Corp A2, Şos. Bucureşti-Ploieşti Nr. 1A, 013681
Bucureşti 1, ROMANIA
CIF RO378660, RC J/40/5106/1991
Cap.Soc. 41.670 Lei
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