On 26/06/13 07:40, Katja Siegemund wrote:
Hello,
I'm trying to get negated data with SPARQL (individuals of an ontology
that do not belong to a certain class), but I could not figure out how
to write the appropriate query therefore. It's working for object
properties and using FILTER NOT EXIST, but this one I can't manage.
Could you help me out here please?
The query should somehow look like this:
"PREFIX
ro:<http://www.semanticweb.org/ontologies/2012/4/test_ontology.owl#>
SELECT ?r WHERE NOT{?r a ro:RelatedRequirement}";
The NOT is just placed here to indicate that I want to get all
individuals that are NOT instances of the ontology class
RelatedRequirement.
Thanks,
Katja
(I don't know the data model)
The approach is to find everything meeting a more general condition then
remove the things that match the specific condition
{?r a ro:RelatedRequirement}.
The more you can limit the initial "find everything / general
condition", the faster the query will go. e.g if they will all have a
particular type, :TypeALL, then use :TypeAll not ?T below.
Then either of:
## Everything with an rdf:type but not ro:RelatedRequirement
SELECT DISTINCT ?r WHERE
{ ?r a ?T
FILTER NOT EXISTS { ?r a ro:RelatedRequirement }
}
SELECT DISTINCT ?r WHERE
{ ?r a ?T
MINUS { ?r a ro:RelatedRequirement }
}
Andy
PS Please start a new thread for a new question - if you reply to an
existing message, even if you change the subject line, then people who
are ignoring the thread will ignore your new question as well.
