# File lib/rdf/redland/model.rb, line 310 def predicates(source,target) if source.class == Uri source = Node.new(source) end if target.class == Uri or target.class == String target =Node.new(target) end my_iterator = Redland.librdf_model_get_arcs(self.model,source.node,target.node) raise RedlandError.new("unable to create iterator") if !my_iterator iterator = NodeIterator.new(my_iterator,self,source,target) if block_given? while not iterator.end? yield iterator.current iterator.next end else return get_node_array(iterator) end end