CODEWITHSUNDEEP
sparqlmarklogicmarklogic-8
TJ Tang
TJ Tang

Reputation: 921

SPARQL 1.1 Property Paths in Marklogic 8

The MarkLogic semantics documentation mentions that all SPARQL 1.1 property paths are supported, with the exception of negation. I have been unable to get the syntax where path length is specified to work, i.e.

elt{n,m}    A path between n and m occurrences of elt.
elt{n}      Exactly n occurrences of elt. A fixed length path.
elt{n,}     n or more occurrences of elt.
elt{,n}     Between 0 and n occurrences of elt.

If I try something like:

select ?leaf ?distance {
      select  ?leaf (count(?mid) as ?distance) { 
        ?leaf <http://schemas.abbvienet.com/ontologies/infrastructure.owl#manager>{1,2} ?mid .
        ?mid <http://schemas.abbvienet.com/ontologies/infrastructure.owl#manager>{1,2} <http://rdf.abbvienet.com/infrastructure/person/10019933> .
      }
      group by ?leaf
    }

I get the following error:

XDMP-UNEXPECTED: (err:XPST0003) Unexpected token syntax error, unexpected {

Does this work for anyone else, or does anyone know whether this path syntax is supported or not in MarkLogic?

Upvotes: 3

Views: 197

Answers (1)

scotthenninger
scotthenninger

Reputation: 4001

See the SPARQL 1.1 specification for property paths - Note this is different than earlier drafts for SPARQL Property Paths, and in particular the n-to-m occurrences of a property was removed.

You also may find this article useful - boundary for arbitrary property path in SPARQL 1.1.

As an aside, not that the sub-select in your query would be superfluous (if the query worked). The following is equivalent to what you have:

select  ?leaf (count(?mid) as ?distance) { 
    ?leaf <http://schemas.abbvienet.com/ontologies/infrastructure.owl#manager>{1,2} ?mid .
    ?mid <http://schemas.abbvienet.com/ontologies/infrastructure.owl#manager>{1,2} <http://rdf.abbvienet.com/infrastructure/person/10019933> .
}
group by ?leaf

Upvotes: 3

Related Questions