How to recursively expand blank nodes in SPARQL construct query?

Question

There is probably an easy to answer to this, but I can\'t even figure out how to formulate the Google query to find it.

I\'m writing SPARQL construct queries against a d

Answer 1

Recursion isn't possible. The closest I can think of is SPARQL 1.1 property paths (note: that version is out of date) but bnode tests aren't available (afaik).

You could just remove the statements with trailing bnodes:

CONSTRUCT {?x ?y ?z .} WHERE 
{
  ?x ?y ?z .
  FILTER (!isBlank(?z))
}

or try your luck fetching the next bit:

CONSTRUCT {?x ?y ?z . ?z ?w ?v } WHERE 
{
  ?x ?y ?z .
  OPTIONAL {
    ?z ?w ?v
    FILTER (isBlank(?z) && !isBlank(?v))
  }
}

(that last query is pretty punishing, btw)

You may be better off with DESCRIBE, which will often skip bnodes.