Justin created JENA-2340:
----------------------------
Summary: bnode() with literal argument
Key: JENA-2340
URL: https://issues.apache.org/jira/browse/JENA-2340
Project: Apache Jena
Issue Type: Bug
Affects Versions: Jena 4.5.0
Reporter: Justin
Attachments: a2.rq, a2.ttl
[^a2.rq]
About the bnode() function:
"If the form with a simple literal is used, every call results in distinct
blank nodes for different simple literals, and the same blank node for calls
with the same simple literal within expressions for one [solution
mapping|https://www.w3.org/TR/sparql11-query/#defn_sparqlSolutionMapping].";
https://www.w3.org/TR/sparql11-query/
In the following example I expected the same bnode to appear multiple times in
the o_node column. But instead Jena doesn't reuse any of the bnodes.
{code:java}
root@354840b30d6f:/mnt# cat ./a2.ttl
@prefix : <http://example/>
:s0 :p "one" .
:s1 :q "one" .
:s1 :p "one" .
:s2 :p "two" .
:s3 :p "two" .
root@354840b30d6f:/mnt# cat ./a2.rq
prefix : <http://example/>
select *
where{
?s ?p ?o
bind(bnode(?o) as ?o_node)
}
root@354840b30d6f:/mnt# ./apache-jena-4.5.0/bin/sparql --data=./a2.ttl
--query=./a2.rq
-----------------------------
| s | p | o | o_node |
=============================
| :s0 | :p | "one" | _:b0 |
| :s3 | :p | "two" | _:b1 |
| :s2 | :p | "two" | _:b2 |
| :s1 | :p | "one" | _:b3 |
| :s1 | :q | "one" | _:b4 |
----------------------------- {code}
How do you get the bnode() function with a literal argument to return the same
bnode?
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