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editorial comments sec 2.6 - 2.8

From: Jeen Broekstra <jeen@aduna.biz>
Date: Thu, 09 Jun 2005 15:35:53 +0200
Message-ID: <42A845B9.7060608@aduna.biz>
To: RDF Data Access Working Group <public-rdf-dawg@w3.org>


SPARQL language editor's draft rev 1.379
http://www.w3.org/2001/sw/DataAccess/rq23/


Section 2.6

Last sentence:

  "This is a simple, conjunctive graph pattern match, and all the
   variables used in the query pattern muts [...]"

   Spelling error, "muts" should be "must".



Section 2.7

In subsection "Blank Nodes and Queries"

I would like it to be made even more clear that the notion of blank
nodes in a query has _nothing_ to do with blank nodes in the data and
merely acts a (anonymous) variable. To that end I suggest adding the
following sentence:

  "A blank node in a query pattern may match against any type of RDF
   term."



Section 2.8

In subsection "Blank Nodes":

  'The following two forms:

   [ :p "v" ].
   [] :p "v".

  allocate a unique blank node (here "b57") and equivalent to writing:

   _:b57 :p "v"  '

This sentence is grammatically incorrect. Suggestion for rewording:

  'The following three forms are equivalent:

   [ :p "v" ] .
   [] :p "v" .
   _:b57 :p "v" .

  The first two forms allocate a unique blank node to the subject of
  the triple pattern. The third pattern allows sharing the blank node
  across multiple triple patterns in the same query by using a blank
  node identifier ("b57").'

Jeen
-- 
Jeen Broekstra          Aduna BV
Knowledge Engineer      Julianaplein 14b, 3817 CS Amersfoort
http://aduna.biz        The Netherlands
tel. +31 33 46599877
Received on Thursday, 9 June 2005 13:37:10 GMT

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