[OSLC] Request for Comment on Common Query Syntax V1

[Arthur Ryman]

Steve,

Thx for the feedback.

For NULL, we need to define the semantics since we are thinking in terms 
of RDF. Does NULL mean the property doesn't exist? (in the case of 
optional properties).

Arthur Ryman, IBM DE
Chief Architect, Rational Project and Portfolio Management
Office: 905-413-3077, Cell: 416-939-5063
Assistant: Nancy Barnes, 905-413-4182 



Steve K Speicher <sspeiche at us.ibm.com> 
Sent by: community-bounces at open-services.net
11/13/2009 11:57 PM

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Re: [OSLC] Request for Comment on Common Query Syntax V1







Arthur Ryman <ryman at ca.ibm.com> wrote on 11/06/2009 10:20:19 AM:

> 2. Nested properties. The CM version allowed nested properties via 
> {}. This is very useful, both for query and inlining of results. I 
> suggest we add this to the spec. 
+1 

> 3. The query parameter names. The CM spec used oslc_cm:query and 
> oslc_cm:properties for what are essentially the WHERE and SELECT 
> clauses of a query, i.e. oslc_cm:query is like the WHERE clause and 
> oslc_cm:properties is like the SELECT clause. Since query is an 
> overloaded term, I suggest we use oslc:select and oslc:where for 
> these parameters, or oslc_select and oslc_where if you don't like 
colons. 

I like the naming oslc:filter and oslc:properties.  That way a consistent 
convention can be used to request the amount of properties whether it is 
either a single resource request or when requesting a collection of 
resources will inlined properties. 

So for a single resource: 
   GET /bug/1?oslc:properties=dc:title,dc:description 
or collection/filter result: 
   GET 
/bugs?oslc:filter=state="new"&oslc:properties=dc:title,dc:description

Additionally, 
I've received some requests to add the concept of "null" as a value. 
Something such as oslc:NULL.  Then you can do statements such as 
owner=oslc:NULL 

Thanks,
Steve Speicher | IBM Rational Software | (919) 254-0645
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