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

[Arthur Ryman]

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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