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Re: Editorial changes in Section 2.5

From: Enrico Franconi <franconi@inf.unibz.it>
Date: Mon, 30 Jan 2006 18:27:16 +0100
Message-Id: <D83518FD-D968-4DC5-8D78-44CBD28678AD@inf.unibz.it>
Cc: RDF Data Access Working Group <public-rdf-dawg@w3.org>
To: Andy Seaborne <andy.seaborne@hp.com>
"A basic graph patterns is a set of triple patterns and forms the  
basis of SPARQL query matching. Matching a basic graph pattern is  
defined in terms of unspecified entailment to allow for future  
extension of the language."

==>

"A basic graph patterns is a set of triple patterns and forms the  
core of any SPARQL query on some dataset. Matching a basic graph  
pattern on a dataset is defined in terms of a generic entailment to  
allow for future extension of the language."

;;;;

"Examples of other E-entailment regimes are, RDF entailment..."

==>

"Examples of other E-entailment regimes are RDF entailment..."

;;;;

I guess that in "Definition: Basic Graph Pattern equivalence", the  
sentence
"that maps blank nodes to blank nodes and maps variables, literals  
and IRIs to themselves."
should be deleted.

;;;;

Why do we still have a long definition of Scoping Set, while we  
probably just want to say that it is an arbitrary subset of the RDF  
Terms (as we say after: "A scoping set B is some set of RDF terms.")?
Maybe you have an argument for it.

;;;;

"A scoping set B is some set of RDF terms. This is an arbitrary  
parameter in this definition. The contents of B should be restricted  
to correspond appropriately to different entailment regimes."

==>

"A scoping set B is some set of RDF terms. The scoping set restricts  
the values of variable assignments in a solution. The scoping set may  
be characterised differently by different entailment regimes."

;;;

Regarding the Definition of Basic Graph Pattern E-matching, I still  
prefer something closer to my proposal, since you want to have the  
right scoping of the parameters (in the current version, the  
situation of BGP' is not clean). You also want to have a more precise  
word instead of "introduced".

"""
Definition: Basic Graph Pattern E-matching
Let E-entails be an E-entailment regime,
BGP a basic graph pattern,
G an RDF graph,
G' a scoping graph for G,
B a scoping set, and
S a pattern solution.
BGP E-matches G with pattern solution S with respect to a scoping  
graph G' and scoping set B,
if there is a basic graph pattern BGP' that is graph equivalent to BGP,
such that:
1/ G' and BGP' do not share any blank node labels,
2/ (G' union S(BGP')) is a well-formed graph for the E-entailment,
3/ G E-entails (G' union S(BGP')),
4/ The range of S is equal to B.
"""

;;;

"These definitions allow for future extensions to SPARQL. This  
document defines SPARQL for simple entailment.
The scoping set B is the set of all RDF terms in G'."

==>

"These definitions allow for future extensions to SPARQL. This  
document defines SPARQL for simple entailment, with the further  
restriction that the scoping set B is the set of all RDF terms in G'."


--e.

Received on Monday, 30 January 2006 17:27:26 GMT

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