- From: Matt Perry <matthew.perry@oracle.com>
- Date: Mon, 04 Jan 2010 16:50:53 -0500
- To: W3C SPARQL Working Group <public-rdf-dawg@w3.org>, Andy Seaborne <andy.seaborne@talis.com>, steve.harris@garlik.com
- CC: "Das,Souripriya" <souripriya.das@oracle.com>, "PERRY,MATTHEW" <matthew.perry@oracle.com>
Hi,
Overall, the draft looks very good. I have some detailed comments below.
Thanks,
Matt
** General Questions:
1) What is the expected behavior for GRAPH queries inside GRAPH queries
(this nesting could occur in a lot of situations)?
I couldn't find a discussion of this in the docs.
For example,
{ GRAPH ?g1 { ?a :p1 ?b GRAPH ?g2 { ?c :p2 ?d } }
Does triple ?c :p2 ?d have to belong to both g1 and g2, or only g2, etc.
** Section 8 Negation:
1) Why have different variable scope for FILTER and non-FILTER cases for
EXISTS and NOT EXISTS? What would we lose by having the non-filter form
apply to the whole group in which the EXISTS / NOT EXISTS appears
instead of only variables defined earlier in the pattern? I'm not sure
why we need this extra complication.
** Section 13.1.2 SELECT expressions:
1) As far as SPARQL grammar is concerned, is "Expression" here the same
as "Expression" in FILTER and ORDER BY? If so, that answers the next
question.
1) Are constants allowed in SELECT expressions (e.g. SELECT ?s
(<http://myProp> as ?p) ?o WHERE ... )? If so, it may be worth adding an
example with a constant.
** Minor Comments:
1) In "Status of this Document": "In this publication,
new content is gathered together for ** easy => ease ** of review
of these new features."
Received on Monday, 4 January 2010 21:51:51 UTC