[oslc-core] Behavior of oslc.where clauses in case of "multi-valued" properties

[Arthur Ryman]

Denilson,

All your example queries would return the resource since in all cases 
there is a match to the oslc.where clause.

The semantics of the OSLC Query is defined in terms of pattern matching, 
which is how SPARQL works too. An OSLC query can be translated into 
SPARQL.

I wrote a couple of documents that described the semantics of the query 
syntax [1] [2] for the benefit of testers and implementers.

[1] http://open-services.net/bin/view/Main/OslcSimpleQuerySemanticsV1
[2] http://open-services.net/bin/view/Main/OslcSimpleQuerySparqlV1

Regards, 
___________________________________________________________________________ 

Arthur Ryman 

DE, PPM & Reporting Chief Architect
IBM Software, Rational 
Toronto Lab | +1-905-413-3077 (office) | +1-416-939-5063 (mobile) 





From:
Denilson Nastacio <dnastaci at us.ibm.com>
To:
oslc-core <oslc-core at open-services.net>
Date:
10/06/2011 02:31 AM
Subject:
[oslc-core] Behavior of oslc.where clauses in case of   "multi-valued" 
properties
Sent by:
oslc-core-bounces at open-services.net



Assuming http://server/resource/query URL that return IPNetwork instances, 
would the above resource show up in query with the following oslc.where 
clauses:

Would the resource below ...

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" 
xmlns:oslc="http://open-services.net/ns/core#"
xmlns:dcterms="http://purl.org/dc/terms/" xmlns:im="
http://tivoli-OSLC-prototypes/ns/im#">
<oslc:IPNetwork rdf:about="
http://dii01.tivlab.raleigh.ibm.com:8080/oslc/rr/shapes/IPNetwork">
<oslc:property>3</oslc:property>
<oslc:property>4</oslc:property>
<oslc:property>5</oslc:property>
...
</oslc:IPNetwork>
</rdf:RDF>

--

...show up in these two queries?
http://server/resource/query?oslc.where = property <= 4
http://server/resource/query?oslc.where = property != 4
http://server/resource/query?oslc.where = property = 4

At the heart of the question is the meaning of the comparison operator in 
cases of multiple matching triples:
- **At least one** matching triple meets the criteria" or 
- **Each** matching triple meets the criteria")

I am guessing the answer depends on the individual operator, but 
consulting the larger group.


Regards



Denilson Nastacio
3901 S Miami Blvd

Chief Programmer for Data Integration Services - SWG Master Inventor
Durham, 27703-9135
7APA
USA
IBM Software Group, Tivoli


Phone:
+1-919-224-1008


Mobile:
+1-919-412-4714


e-mail:
dnastaci at us.ibm.com


_______________________________________________
Oslc-Core mailing list
Oslc-Core at open-services.net
http://open-services.net/mailman/listinfo/oslc-core_open-services.net