CODEWITHSUNDEEP
rdfsparqlsemantic-webowlvirtuoso
Nosakos
Nosakos

Reputation: 23

Using sameAs in virtuoso sparql between multiple graphs

I am using virtuoso 7.2.1 and i am trying to run a sparql query between 3 graphs.

G1 contains:

@prefix : <http://test#> .
:bob :hasAddress :add1 .

G2 contains:

@prefix : <http://test#> .
:bob :hasAddress :add2 .

and G3 contains:

@prefix : <http://test#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
:add1 owl:sameAs :add2 .

The sparql i'm trying to run in virtuoso is:

DEFINE input:same-as "yes"
Select *
from <http://G1>
from <http://G3>
Where{
<http://test#bob> <http://test#hasAddress> ?z .
}

result: 

<http://test#add1>

expected result: 

<http://test#add1>
<http://test#add2>

Note: If i use a single graph(G1,G2,G3 merged to G graph) i get the expected result. Why this doesnt work with multiple graphs. Thanks.

-----------------------------------EDIT--------------

Respectively this query:

DEFINE input:same-as "yes"
Select *
from <http://G2>
from <http://G3>
Where{
<http://test#bob> <http://test#hasAddress> ?z .
}

or this query:

DEFINE input:same-as "yes"
Select ?z
from named <http://G2>
from named <http://G3>
Where{
graph ?g {<http://test#bob> <http://test#hasAddress> ?z .}
}

has only this result: 

<http://test#add2>

Upvotes: 2

Views: 574

Answers (1)

TallTed
TallTed

Reputation: 9444

You're excluding G2 from your original query, and G1 from your second and third queries. sameAs doesn't add a FROM clause to your query; it just says "these two URIs reference the same entity."

Try these --

DEFINE  input:same-as  "yes"
SELECT  *
  FROM  <http://G1>
  FROM  <http://G2>
  FROM  <http://G3>
 WHERE 
   {
     <http://test#bob>  <http://test#hasAddress>  ?z 
   }

-- and --

DEFINE  input:same-as  "yes"
SELECT  *
  FROM  <http://G1>
  FROM  <http://G2>
  FROM  <http://G3>
 WHERE
   {
     <http://test#bob>  <http://test#hasAddress>  ?z 
   }

-- and --

DEFINE  input:same-as  "yes"
SELECT  ?z
  FROM  NAMED <http://G1>
  FROM  NAMED <http://G2>
  FROM  NAMED <http://G3>
 WHERE
   {
     GRAPH  ?g 
       {  <http://test#bob>  <http://test#hasAddress>  ?z  }
   }

Upvotes: 1

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