Incomplete sem:sparql results for Property Paths when "optimize=0"

Question

Consider the following subClassOf relations:

m1
|_ m1_1
   |_ m1_1_1

The following query correctly returns m1_1 and m1_1_1:

sem:sparql('
SELECT * 
WHERE { 
 ?s <http://www.w3.org/2000/01/rdf-schema#subClassOf>+ <http://example.org/people#m1> .
}', (), 
("optimize=1"))

However, the following query only returns m1_1:

sem:sparql('
SELECT * 
WHERE { 
 ?s <http://www.w3.org/2000/01/rdf-schema#subClassOf>+ <http://example.org/people#m1> .
}', (), 
("optimize=0"))

It's also the case with *.

After upgrading to MarkLogic 8.0-5.2, the previous sem:sparql queries return correct results but not when the object is a parameter. E.g. the following query doesn't return anything:

sem:sparql('
SELECT * 
WHERE {
?s <http://www.w3.org/2000/01/rdf-schema#subClassOf>+ ?item . 
}',
(map:new ((map:entry ("item", sem:iri("http://example.org/people#m1"))))), 
("optimize=0"))

Without seeing your data, we can't reproduce this. It could be, e.g., a typo in one of the class IRIs. (I doubt that it is, but this isn't a complete example that any one can use to test. ) — Joshua Taylor, May 30 '16 at 15:44
What version of MarkLogic are you using? On 8.0-5.2, I get the same results setting `optimize` to 1 or 0. — scotthenninger, May 30 '16 at 22:34
@JoshuaTaylor: my data is as simple as I described, only two subClass relations between three URIs. — user5552435, May 30 '16 at 23:29
I tried on a pretty complex hierarchy with 15M triples. Is it possible to upgrade? There was some significant semantics work around 8.0-4.0. — scotthenninger, May 31 '16 at 01:02
Excellent, I'll migrate to an answer for the sake of completeness. — scotthenninger, May 31 '16 at 02:41
@scotthenninger: After upgrading to MarkLogic 8.0-5.2, the previous sem:sparql queries return correct results but not when the object is a parameter passed to sem:sparql. I've added an example query to the question. — user5552435, May 31 '16 at 06:10

score 1 · Accepted Answer · answered May 31 '16 at 06:17

Here are some possible workarounds:

sem:sparql('
SELECT * 
WHERE {
BIND (?param AS ?item) .
?s <http://www.w3.org/2000/01/rdf-schema#subClassOf>+ ?item . 
}',
(map:new ((map:entry ("param", sem:iri("http://example.org/people#m1"))))), 
("optimize=0"))

Or

sem:sparql('
SELECT * 
WHERE {
?s <http://www.w3.org/2000/01/rdf-schema#subClassOf>+ ?item . 
FILTER (?item = ?param) .
}',
(map:new ((map:entry ("param", sem:iri("http://example.org/people#m1"))))), 
("optimize=0"))

The filter approach also works very well when param contains a sequence of IRI's.. — grtjn, May 31 '16 at 07:34

score 0 · Answer 2 · answered May 31 '16 at 02:41

0

Checking with a a fairly complex RDFS ontology using MarkLogic 8.0-5.2, this seems to work OK. Is it possible to upgrade? There was some significant semantics work around 8.0-4.0.

answered May 31 '16 at 02:41

scotthenninger

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Incomplete sem:sparql results for Property Paths when "optimize=0"

2 Answers2