[oslc-core] Core Specification Version 2.0 Query Syntax: Prefixed Names
Steven B Pitschke
pitschke at us.ibm.com
Tue Jul 10 09:30:23 EDT 2012
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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