anchor.diff:          r1.subject 
         from _rdf_m r1 
         join _rdf_m r2 on r2.subject = r1.subject 
  -      join _rdf_m r3 on r3.subject = r1.subject 
  -      where r1.predicate = 'rdf:type' 
  -      and r1.object = 'skos:Concept'
  -      and r2.predicate = 'skos:inScheme' 
  -      and r2.object = $$#{ @conceptScheme}$$ ; } , nil )%>
  +      left join _rdf_m r3 on r3.subject = r1.subject 
  +      where r1.predicate = 'rdf:type' and r1.object = 'skos:Concept'
  +      and r2.predicate = 'skos:inScheme' and r2.object = '#{ @conceptScheme}' 
  +      and r3.predicate = 'skos:broader' and r3.object is null 
  +      ;
  +      } , nil )%>
       <%= @concept%>
     <% end %>
   
  
positive.code:         where r1.predicate = 'rdf:type' 
          and r1.object = 'skos:Concept'
          and r2.predicate = 'skos:broader' 
          and r2.object = $$#{ @narrower}$$ ; } , nil )%>
        <%= @narrower2%>
        <% end %>
      <% end %>
  
negative.code:       where r1.predicate = 'rdf:type' 
        and r1.object = 'skos:Concept'
        and r2.predicate = 'skos:broader' 
        and r2.object = '#{ @topConcept}' ; } , nil )%>
      <%= @narrower%>
  
  
  