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Re: SPARQL Variable Binding Results XML Format draft - for review

From: Seaborne, Andy <andy.seaborne@hp.com>
Date: Mon, 13 Dec 2004 15:31:14 +0000
Message-ID: <41BDB5C2.9030302@hp.com>
To: Dave Beckett <dave.beckett@bristol.ac.uk>
CC: public-rdf-dawg@w3.org

Publishing this draft is acceptable to me.

	Andy

Comments:

1/ Unbound variables should not be mentioned in <result> to avoid the issue with

"""
ISSUE: This is a problem, you cannot distinguish a bound variable value with an 
empty string literal, from a variable with no binding.
"""

because we now have all the variables declared in the header.

2/ """Note: The blank node label I may not be the same string used as the blank 
node label in the query graph."""

A serializer might not actually know the blank node label in the query graph so 
can't guarantee this feature.  It may just know whether two bNodes are the same 
or different.

I think this should say that the blank node label I is scoped to the result set 
XML document and does not make any association with graph bNode label.

3/ Observation: I thought you were proposing using rdf:datatype, rdf:nodeID.  I 
see "datatype" and "id".  That's fine - it drops the need for rdf: namespace.

4/ """ISSUE: XML Style - dawg-results needs a better name"""

It's <dawg-result> in the example above this line, not "dawg-results"

5/ Could the example be extended to have the same bNode in one place as well as 
a different bNode in another place?  Currently, there is just two different 
bNodes which does not illustrate the use of the same id=""  As HTML/XML IDs are 
  different everywhere, the name "id" might be confusing.

I don't speak fluent RelexNG but the following seem odd:

A/ Use of #decimal

datatypes xsd =" http://www.w3.org/2001/XMLSchema#decimal"

Why #decimal? Is this (xsd) just for xsd:anyURI later?

B/ nameAttr

var = element * {
      xmllang?, nameAttr?, hrefAttr?, datatypeAttr?, idAttr?, literal
}

nameAttr = attribute name { string }

I don't see where the attribute "name" fits in.  Is this remains from the <var> 
form?

	Andy



Dave Beckett wrote:
> I've updated
>   SPARQL Variable Binding Results XML Format
>   http://www.w3.org/2001/sw/DataAccess/rf1/
> 
> to include some words as well as example, rdf query, xslt, XML Query
> and outputs.  There are a few issues:
> 
>      ISSUE: This is a problem, you cannot distinguish a bound variable
>      value with an empty string literal, from a variable with no
>      binding.
> 
> Either go with <var empty="something"/"> or omit the <var/>?
> 
>      ISSUE: XML Style - dawg-results needs a better name
> 
> If I called it results then I'd need some new name for the <results> element.
> 
>      ISSUE: XML style - rename variables to header or head?
> 
> But I can't think of anything else that'd go in the header at present.
> 
>      ISSUE: Normativeness of the XML schemas. Pick one?
> 
> I write in RELAX NG compact, so that'd be the only one I'd be
> confident in.
> 
> Dave
> 
Received on Monday, 13 December 2004 15:32:20 GMT

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