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Re: Agenda SPARQL TC 2009-01-05

From: Axel Polleres <axel.polleres@deri.org>
Date: Tue, 5 Jan 2010 14:27:39 +0000
Cc: "Andy Seaborne" <andy.seaborne@talis.com>, "SPARQL Working Group" <public-rdf-dawg@w3.org>
Message-Id: <0191A597-E2B7-47CE-99BB-F715B5E78110@deri.org>
To: "Birte Glimm" <birte.glimm@comlab.ox.ac.uk>
I don't see any problems with that reformulation and it seems to be clearer 
indeed to include that in the definition. Andy? Steve?

We probably won't get there today, but will keep it in mind to bring 
this up separately in the agenda in some of the next TCs.

Axel

On 5 Jan 2010, at 14:14, Birte Glimm wrote:

> The current definition says:
> A Pattern Instance Mapping, P, is the combination of an RDF instance
> mapping, σ, and solution mapping, μ. P(x) = μ(σ(x))
> 
> below the definition there the new sentence:
> For a BGP 'x', P(x) denotes the result of replacing blank nodes b in x
> for which σ is defined with σ(b) and all variables v in x for which μ
> is defined with μ(v).
> 
> I suggest to put that sentence into the definition and relate it to
> P(x) = μ(σ(x)). For example:
> A Pattern Instance Mapping, P, is the combination of an RDF instance
> mapping, σ, and solution mapping, μ. For a BGP x, P(x) denotes the
> result of replacing each blank node b in x for which σ is defined with
> σ(b) and each variable v in x for which μ is defined with μ(v), also
> denoted as P(x) = μ(σ(x)).
> 
> Basically, my goal is to make this definition clearer. I think the
> definition should say what x is since it is not a defined term like
> RDF-T for example. I also think the definition should say what it
> means to apply a solution mapping or an RDF instance mapping to a BGP.
> These are mappings from variables/bnodes to terms. It is never defined
> what the functions to with BGPs. They don't map BGPs to terms. Here it
> is assumed that they replace
> variables/bnodes with the corresponding mappings. That has to be said
> IMO. It can all be guessed, but it is a definition and it is an
> important definition. I do not suggest to change anything in the
> meaning. For me that still counts as errata because the definition
> just did not mention what it should have mentioned.
> 
> Anyway, I just wanted the spec to be clear, but if there are
> objections, I will not spend any more time on this issue.
> 
> Birte
> 
> 2010/1/4 Axel Polleres <axel.polleres@deri.org>:
> > Hi Birte,
> >
> >> Query 1.1 uses the Query 1.0 definition and adds a sentence below to
> >> clarify this, but I would prefer to actually extend the definition
> >> accordingly if the WG is not opposed to that. IMO, the definition
> >> leaves a lot for readers to figure out themselves and it is quite an
> >> essential definition. Such a change would not change the meaning of
> >> the definition, but extend it so that it is clear what is meant.
> >
> > Do you have a concrete proposal for improval to extend the definition?
> > I'd assume if so, we can discuss it, although probably there is not
> > enough  time left to agree and include it in this round, so I'd prefer to
> > postpone this issue to after the next WD round.
> >
> > best,
> > Axel
> >
> > On 4 Jan 2010, at 15:00, Birte Glimm wrote:
> >
> >> Axel,
> >> if there is some time in tomorrow's telecon, I would like to discuss
> >> whether it is possible to clarify the definition of Pattern Instance
> >> Mapping in Query 1.1.
> >>
> >> The Query 1.0 definition says:
> >> A Pattern Instance Mapping, P, is the combination of an RDF instance
> >> mapping, σ, and solution mapping, μ. P(x) = μ(σ(x))
> >>
> >> The problem is that it is never said what x is and readers have to
> >> guess that it is a BGP. Even if they guess that x is a BGP, then it is
> >> still the case that sigma and mu are only defined for blank nodes and
> >> variables as input, so readers again have to guess that in this case
> >> it is meant that the blank nodes and variables in the BGP x are
> >> replaced with the values given by mu and sigma.
> >>
> >> Query 1.1 uses the Query 1.0 definition and adds a sentence below to
> >> clarify this, but I would prefer to actually extend the definition
> >> accordingly if the WG is not opposed to that. IMO, the definition
> >> leaves a lot for readers to figure out themselves and it is quite an
> >> essential definition. Such a change would not change the meaning of
> >> the definition, but extend it so that it is clear what is meant.
> >
> > Do you have a concrete proposal to extend the definition?
> >
> >> Birte
> >>
> >>
> >> 2010/1/4 Axel Polleres <axel.polleres@deri.org>:
> >> > Dear all,
> >> >
> >> > first of all, Happy 2010 and looking fwd to welcome you to our first TC this year!
> >> > On Tuesday, we obviously want to check the status of the reviews and go through them as far
> >> > as there are any critical comments. We should also check the schedule in case there are reviews
> >> > missing still, since we want to make a decision to publish (based on reviews & subsequent
> >> > updates made by editors) in two weeks at the latest.
> >> >
> >> > In case we still have time left with all that on Tuesday (given the speed we rushed through all
> >> > docs in the last TC before christmas, you never know), I'd like to have a look over the
> >> > update ISSUEs mentioned in Paul's and Andy's mails [1,2].
> >> >
> >> > 1. http://lists.w3.org/Archives/Public/public-rdf-dawg/2009OctDec/0628.html
> >> > 2. http://lists.w3.org/Archives/Public/public-rdf-dawg/2009OctDec/0674.html),
> >> >
> >> > The agenda can be found as usual at: http://www.w3.org/2009/sparql/wiki/Agenda-2010-01-05
> >> > Will try to complete links to the reviews sent so far before the TC...
> >> >
> >> > best,
> >> > Axel
> >> >
> >> > ============================
> >> > Call in details
> >> >
> >> > When joining please don't identify yourself verbally; instead, identify yourself to Zakim on IRC
> >> >
> >> >        • Date of Call: Tuesday January 05, 2010
> >> >        • Time of Call: 15:00 UK, 10:00 (East US)
> >> >        • Dial-In #: +1.617.761.6200 (Cambridge, MA)
> >> >        • Dial-In #: +33.4.89.06.34.99 (Nice, France)
> >> >        • Dial-In #: +44.117.370.6152 (Bristol, UK)
> >> >        • Participant Access Code: 77277# (SPARQ)
> >> >        • IRC Channel: irc.w3.org port 6665 channel #sparql ([irc:irc.w3.org:6665/sparql])
> >> >        • Web-based IRC (member-only): http://www.w3.org/2001/01/cgi-irc (Firefox IRC addon: chatzilla)
> >> >        • Duration: 60 minutes
> >> >        • Chair: Axel Polleres
> >> >        • Scribe: Olivier Corby (Scribe List)
> >> >        • Link to Agenda: http://www.w3.org/2009/sparql/wiki/Agenda-2010-01-05
> >> >
> >> > [edit] Agenda
> >> >
> >> >        • Admin
> >> >                • PROPOSED: Approve minutes at http://www.w3.org/2009/sparql/meeting/2009-12-22
> >> >                • Next meeting: 2010-01-12 @ 15:00 UK / 10:00 EST (scribe: Alex Passant)
> >> >        • Comment handling - see http://www.w3.org/2009/sparql/wiki/Comments
> >> >        • Liaisons - Anything to report?
> >> >                • RIF WG (Axel)
> >> >                • RDB2RDF WG (Orri)
> >> >                • eGov (SteveH)
> >> >        • Document Reviews and schedule for publication:
> >> >                • http://www.w3.org/2009/sparql/docs/query-1.1/
> >> >                • http://www.w3.org/2009/sparql/docs/update-1.1/
> >> >                • http://www.w3.org/2009/sparql/docs/protocol-1.1/
> >> >                • http://www.w3.org/2009/sparql/docs/service-description-1.1/
> >> >                • http://www.w3.org/2009/sparql/docs/http-rdf-update/
> >> >                • http://www.w3.org/2009/sparql/docs/property-paths/Overview.xml
> >> >                • http://www.w3.org/2009/sparql/docs/entailment/xmlspec.xml
> >> >        • Time allowed: Update ISSUEs, Can we close some? see Paul's and Andy's mails.
> >> > [edit] Regrets
> >> >
> >> >        • Lee Feigenbaum
> >> >
> >> >
> >> >
> >>
> >>
> >>
> >> --
> >> Dr. Birte Glimm, Room 306
> >> Computing Laboratory
> >> Parks Road
> >> Oxford
> >> OX1 3QD
> >> United Kingdom
> >> +44 (0)1865 283529
> >>
> >
> >
> 
> 
> 
> --
> Dr. Birte Glimm, Room 306
> Computing Laboratory
> Parks Road
> Oxford
> OX1 3QD
> United Kingdom
> +44 (0)1865 283529
> 
Received on Tuesday, 5 January 2010 14:28:15 GMT

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