[oslc-core] Core Specification Version 2.0 Query Syntax: Prefixed Names

[Arthur Ryman]

Steve,

Given that the SPARQL grammar rules do make sense and that they are part 
of the spec, what's the harm in supporting them?

Regards, 
___________________________________________________________________________ 

Arthur Ryman 

DE, Chief Architect, Reporting &
Portfolio Strategy and Management
IBM Software, Rational 

Toronto Lab | +1-905-413-3077 (office) | +1-416-939-5063 (mobile) 





From:
Nick Crossley/Irvine/IBM at IBMUS
To:
Steven B Pitschke/Lexington/IBM at IBMUS
Cc:
oslc-core at open-services.net, Arthur Ryman <ryman at ca.ibm.com>
Date:
07/10/2012 10:09 AM
Subject:
Re: [oslc-core] Core Specification Version 2.0 Query Syntax:    Prefixed 
Names


I would object to disallowing predicates of the form ':comment' in OSLC 
queries. As Arthur mentioned, in our SPARQL and Turtle examples, we 
frequently use precisely this form with the prefix ':' defined as the URI 
for some local server - such as those generated for custom properties.  So 
while the OSLC specs themselves do not need to use prefixed names of the 
form ':comment', a user of one of our OSLC providers might well want to do 
precisely this when writing a query for several custom properties.

I would have no particular objection to removing support for PN_PREFIX ':' 
or just plain ':', though I question the value of the restriction.

Nick.




From:   Steven B Pitschke/Lexington/IBM at IBMUS
To:     Arthur Ryman <ryman at ca.ibm.com>, 
Cc:     oslc-core at open-services.net, oslc-core-bounces at open-services.net
Date:   07/10/2012 06:35 AM
Subject:        Re: [oslc-core] Core Specification Version 2.0 Query 
Syntax: Prefixed        Names
Sent by:        oslc-core-bounces at open-services.net



Hi Arthur, 

Yes, I am exactly suggesting we restrict it to 

 PrefixedName := PN_PREFIX ':' PN_LOCAL 

I am currently working on an implementation of the server side of query 
for 
the Lyo project.  I will change my grammar to use the above, What is the 
procedure for changing the OSLC core spec? 

Steve Pitschke
Development Lead for IBM Rational Connector for SAP Solution Manager



From:        Arthur Ryman <ryman at ca.ibm.com> 
To:        Steven B Pitschke/Lexington/IBM at IBMUS 
Cc:        oslc-core at open-services.net, 
oslc-core-bounces at open-services.net 
Date:        07/10/2012 07:57 AM 
Subject:        Re: [oslc-core] Core Specification Version 2.0 Query 
Syntax: Prefixed        Names 



Steven,

All of your examples ( ":", "dcterms:" or ":comment") have clear semantics 

and are frequently used in SPARQL and Turtle.

":" means the URI associated with the prefix ":"
"dcterms:" means just the URI associated with the prefix "dcterms:"

Neither of the above is likely to appear in a query string.

":comment" is the concatenation of the URI associate with the prefix ":" 
and the local part "comment". This could be a valid predicate that might 
appear in a query string.

In practice, no OSLC spec uses ":" as a prefix.

Are you suggesting we restrict the grammar to only allow "reasonable" 
prefixed names? In that case, I believe the practice is to use prefixed 
names of the form:

PrefixedName := PN_PREFIX ':' PN_LOCAL

Regards, 
___________________________________________________________________________ 


Arthur Ryman 

DE, Chief Architect, Reporting &
Portfolio Strategy and Management
IBM Software, Rational 

Toronto Lab | +1-905-413-3077 (office) | +1-416-939-5063 (mobile) 





From:
Steven B Pitschke <pitschke at us.ibm.com>
To:
oslc-core at open-services.net
Date:
06/29/2012 01:15 PM
Subject:
[oslc-core] Core Specification Version 2.0 Query Syntax: Prefixed Names
Sent by:
oslc-core-bounces at open-services.net



The core query specification 

       http://open-services.net/bin/view/Main/OSLCCoreSpecQuery 

defers to the SPAQL specifction for Prefixed Names 

       PrefixedName  ::= /* see "SPARQL Query Language for RDF", 
http://www.w3.org/TR/rdf-sparql-query/#rPrefixedName */ 

However, the semantics and usefulness of some the allowed terminals are 
not clear 
to me: 

[68] PrefixedName := PNAME_LN  |  PNAME_NS 

[71] PNAME_NS := PN_PREFIX? ':' 
[72] PNAME_LN := PNAME_NS PN_LOCAL 


For example, what would the prefixed names of ":", "dcterms:" or 
":comment" mean?   I think 
it would be better to only support 

       PrefixedName := ( PN_PREFIX ':' PN_LOCAL ) | PN_LOCAL 

which have fairly clear semantics. 

Steve Pitschke
Senior Software Engineer and Architect 
Rational Software, IBM_______________________________________________
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