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RIF Review of SPARQL RIF ER[Fwd: Solicitation of feedback]

From: Sandro Hawke <sandro@w3.org>
Date: Mon, 19 Jul 2010 11:24:45 -0400
To: public-rif-wg <public-rif-wg@w3.org>
Message-ID: <1279553085.6360.22.camel@waldron>
See forward message.

attached mail follows:


In the W3C DAWG, we recently published an updated working draft of the
SPARQL 1.1 Entailment Regimes.  I understand the RIF WG is closing soon and
was hoping to get some input regarding the RIF entailment regime (section 7
RIF Core Entailment) in an official capacity before hand (if it is still

In particular we were hoping for input in the following areas indicated in
editor's notes:

7.1 Referencing a RIF Core document

"The namespace and URI used for rif:imports is still under discussion within
the group" 

We are currently re-using the rif namespace for this predicate and have not
resolved whether this is appropriate given that we restrict usage to only
the http://www.w3.org/ns/entailment/Simple profile in forming RIF-RDF
combinations for the regime and the concern in making such a predicate too
specific to SPARQL.

Also, would the forthcoming RIF in RDF specification be a more appropriate
approach than the current import mechanism by allowing the RIF combination
to be formed directly from any RIF expressed as RDF in the scoping graph -
rather than by explicit inclusion as we currently do?

7.2 (Simple) RIF Core Entailment Regime

"It is unclear whether safe RIF-Core rules used to form combinations for
this entailment regime guarantee uniqueness (up to RDF graph equivalence) on
answer sets [...] Without strongly safe restrictions, there may be
interoperability issues ... However, strong safety restrictions are only
defined in the informative sections of the RIF-Core specification"

Can you give any background into why the strong safety characteristics are
only an informative part of the specification that might help in informing
conditions for preventing trivial infinite answers as appropriate for the
RIF regime if the use of the strong safety criteria is not appropriate for

Thanks in advance



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Received on Monday, 19 July 2010 15:24:47 UTC

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