[Rdfapi-php-interest] Missing some query results in XML results?

[Ian B. J. <ij...@w3...>]

Hi Richard,

Today we were using RAP and realized that our query does not
seem to be returning all of the (combinatorial) results in XML
that we expect. Here's the test:

 * In our data [1], something may have more than one type
   (defined here [2]). For instance, a document may be both
   a "FirstEdition" and a "REC".=20

   [1] http://www.w3.org/2002/01/tr-automation/tr.rdf =20
   [2] http://www.w3.org/2001/02pd/rec54.rdf

 * The query below should return results that show that the resource
   identified by this URI:

      http://www.w3.org/TR/REC-html40-971218

   is both a rec:FirstEdition and a rec:REC. Instead the query results
   only attest to it being a rec:REC.

   Note: You can probably construct a much simpler query to test this...

 * As an aside, we have encountered a similar issue of not getting
   back all of the results we expect in the rasqal library; see
   this bug report:
     http://bugs.librdf.org/mantis/view.php?id=3D77

   I mention this only because the issue of "getting back all the
   combinatorial possibilities in XML" seems to be the same; not that =20
   the implementation issue is in any way related.

I hope this report is useful.=20

 _ Ian

----------------------------------------------------------
PREFIX : <http://www.w3.org/2000/10/swap/pim/contact#>
PREFIX doc: <http://www.w3.org/2000/10/swap/pim/doc#>
PREFIX mat: <http://www.w3.org/2002/05/matrix/vocab#>
PREFIX org: <http://www.w3.org/2001/04/roadmap/org#>
PREFIX rec: <http://www.w3.org/2001/02pd/rec54#>=20
PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
PREFIX dc:  <http://purl.org/dc/elements/1.1/>
SELECT ?doc ?editor ?title ?date ?versionOf ?type ?supersedes
?previous WHERE {?doc  rdf:type ?type; dc:title ?title; dc:date ?date;
doc:versionOf ?versionOf. OPTIONAL {?doc rec:supersedes ?supersedes}
OPTIONAL {?doc rec:previousEdition ?previous} OPTIONAL {?versionOf
rec:supersedes ?supersedes} OPTIONAL {?doc  rec:editor
[:fullName ?editor ] .}} ORDER BY DESC(?date)


--=20
Ian Jacobs (ij...@w3...)   http://www.w3.org/People/Jacobs
Tel:                     +1 718 260-9447