Assuming some data as below:
========================================
prefix : <http://example.org/ontology/test/>
with <http://example.org/dataset/test/>
insert
{
<http://example.org/data/test/DummyClass_1> a :DummyClass .
<http://example.org/data/test/DummyClass_1> :predA "Entity 1" .
<http://example.org/data/test/DummyClass_1> :objPred <
http://example.org/data/test/DummyClass_2> .
<http://example.org/data/test/DummyClass_2> a :DummyClass .
<http://example.org/data/test/DummyClass_2> :predA "Entity 2" .
<http://example.org/data/test/DummyClass_2> :objPred <
http://example.org/data/test/DummyClass_3> .
<http://example.org/data/test/DummyClass_3> a :DummyClass .
<http://example.org/data/test/DummyClass_3> :predA "Entity 3" .
<http://example.org/data/test/DummyClass_3> :objPred <
http://example.org/data/test/DummyClass_4> .
<http://example.org/data/test/DummyClass_4> a :DummyClass .
<http://example.org/data/test/DummyClass_4> :predA "Entity 4" .
<http://example.org/data/test/DummyClass_4> :objPred <
http://example.org/data/test/DummyClass_1> .
}
========================================
I want to get some results back that include every triple from some anchor
point to a given depth. So, say I start with <
http://example.org/data/test/DummyClass_1> and use depth 2, I'd like to get
everything for DummyClass_1/DummyClass_2/DummyClass_3 but not DummyClass_4.
I figure this might be possible with transitivity and the OPTION clause but
I can't seem to get more than about 90% to what I need.
Secondly, I got a DB crash doing this query with the below data:
===================================================
prefix : <http://example.org/ontology/test/>
with <http://example.org/dataset/test/>
SELECT
*
WHERE
{
{
SELECT ?anchor ?s ?p ?o
WHERE
{
?anchor ?pred ?s .
?s ?p ?o .
}
}
OPTION ( TRANSITIVE,
t_distinct,
t_in(?anchor),
t_out(?s),
t_min (0),
t_max (3) ,
t_no_cycles,
t_step (?s) as ?link, t_step ('path_id') as ?path,
t_step ('step_no') as ?dist ) .
FILTER ( ?anchor = <http://example.org/data/test/DummyClass_1>)
}
ORDER BY ?dist
===================================================
I'm pretty sure this is because I used ?s in the t_step parameter instead
of ?anchor but I'm not quite sure why this caused a crash.
This seems to occur on DBPedia also (sorry).
--
Quentin | Clear Blue Water Pty Ltd
quent...@clearbluewater.com.au
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