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/
jena
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c52f52f1cdb40271473b2146b1d049d553d3c2cb
/
.
/
jena-arq
/
testing
/
ARQ
/
Expr1
/
expr-3.rq
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PREFIX dc
:
<
http
:
//purl.org/dc/elements/1.1/>
PREFIX x
:
<
http
:
//example.org/ns#>
SELECT
?
title
?
price
WHERE
{
?
book dc
:
title
?
title
.
OPTIONAL
{
?
book x
:
price
?
price
}
.
FILTER
(
(
!
bound
(?
price
)
)
||
(
?
price
<
15
)
)
.
}