@prefix rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix log:  <http://www.w3.org/2000/10/swap/log#> .
@prefix string:  <http://www.w3.org/2000/10/swap/string#> .

@prefix ldif: <http://www.w3.org/2007/ont/ldif#>.

{   ?x ?p ?y.
    ?p log:uri [ string:startsWith "http://www.w3.org/2007/ont/ldif#"]}
  =>  {?x ?p ?y}.