Dear Sir/Madam,
Noticed one strange thing while executing SPARQL queries on Virtuoso
through Virtuoso Sparql Query Form.
I have two queries( the only difference between them is absence of the order
by clause in the second query ) :
select distinct ?assocUri {?assocUri <
http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <
http://www.w3.org/2002/07/owl#ObjectProperty>. } ORDER BY ?assocUri
This query returns following data:
<?xml version="1.0" ?>
<sparql xmlns="http://www.w3.org/2005/sparql-results#"; xmlns:xsi="
http://www.w3.org/2001/XMLSchema-instance"; xsi:schemaLocation="
http://www.w3.org/2001/sw/DataAccess/rf1/result2.xsd";>
<head>
<variable name="assocUri"/>
</head>
<results distinct="false" ordered="true">
<result>
<binding name="assocUri"><uri>
http://www.owl-ontologies.com/Ontology1220554345.owl#exemplarAliquot
</uri></binding>
</result>
<result>
<binding name="assocUri"><literal>
http://www.owl-ontologies.com/Ontology1220554345.owl#persChild
</literal></binding>
</result>
<result>
<binding name="assocUri"><literal>
http://www.owl-ontologies.com/Ontology1220554345.owl#persDZTwin
</literal></binding>
</result>
<result>
<binding name="assocUri"><literal>
http://www.owl-ontologies.com/Ontology1220554345.owl#persKinsman
</literal></binding>
</result>
<result>
<binding name="assocUri"><literal>
http://www.owl-ontologies.com/Ontology1220554345.owl#persMZTwin
</literal></binding>
</result>
<result>
<binding name="assocUri"><literal>
http://www.owl-ontologies.com/Ontology1220554345.owl#persParent
</literal></binding>
</result>
<result>
<binding name="assocUri"><literal>
http://www.owl-ontologies.com/Ontology1220554345.owl#persSample
</literal></binding>
</result>
<result>
<binding name="assocUri"><literal>
http://www.owl-ontologies.com/Ontology1220554345.owl#persSibling
</literal></binding>
</result>
<result>
<binding name="assocUri"><literal>
http://www.owl-ontologies.com/Ontology1220554345.owl#pers_ZTwin
</literal></binding>
</result>
</results>
</sparql>
The second query:
select distinct ?assocUri {?assocUri <
http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <
http://www.w3.org/2002/07/owl#ObjectProperty>. }
This query returns :
<?xml version="1.0" ?>
<sparql xmlns="http://www.w3.org/2005/sparql-results#"; xmlns:xsi="
http://www.w3.org/2001/XMLSchema-instance"; xsi:schemaLocation="
http://www.w3.org/2001/sw/DataAccess/rf1/result2.xsd";>
<head>
<variable name="assocUri"/>
</head>
<results distinct="false" ordered="true">
<result>
<binding name="assocUri"><uri>
http://www.owl-ontologies.com/Ontology1220554345.owl#persDZTwin
</uri></binding>
</result>
<result>
<binding name="assocUri"><uri>
http://www.owl-ontologies.com/Ontology1220554345.owl#persKinsman
</uri></binding>
</result>
<result>
<binding name="assocUri"><uri>
http://www.owl-ontologies.com/Ontology1220554345.owl#persMZTwin
</uri></binding>
</result>
<result>
<binding name="assocUri"><uri>
http://www.owl-ontologies.com/Ontology1220554345.owl#pers_ZTwin
</uri></binding>
</result>
<result>
<binding name="assocUri"><uri>
http://www.owl-ontologies.com/Ontology1220554345.owl#persSample
</uri></binding>
</result>
<result>
<binding name="assocUri"><uri>
http://www.owl-ontologies.com/Ontology1220554345.owl#persSibling
</uri></binding>
</result>
<result>
<binding name="assocUri"><uri>
http://www.owl-ontologies.com/Ontology1220554345.owl#persChild
</uri></binding>
</result>
<result>
<binding name="assocUri"><uri>
http://www.owl-ontologies.com/Ontology1220554345.owl#persParent
</uri></binding>
</result>
<result>
<binding name="assocUri"><uri>
http://www.owl-ontologies.com/Ontology1220554345.owl#exemplarAliquot
</uri></binding>
</result>
</results>
</sparql>
So If I have the order by clause in my query I get literals instead of
URI`s, and If I do not have order by clause I recieve URIs, as I would
expect.
Could I ask you to give some comments on this ?
Best regards,
S. Rikacovs.
