anchor.diff:        for cc in concepts do
         begin
           ok := false;
  +        val := false;
           for cp in cc.properties.forEnum do
  +        begin
             if not ok and (cp.code = pp.code) then
  +          begin
  +            val := true;
               case pp.type_ of
                 cptCode, cptString, cptInteger, cptBoolean, cptDateTime, cptDecimal:
                   ok := cp.value.primitiveValue = value;
  
positive.code:       for cp in cc.properties.forEnum do
        begin
          pp := getProperty(cp.code);
          if (pp <> nil) and hasProp(props, cp.code, true) then
          begin
            p := resp.addprop(cp.code);
            p.value := cp.value.link; // todo: should we check this?
          end;
        end;
    finally
  
negative.code:                   end;
                  end;
              end;
            end;
          end;
          if ok or not (val and (pp.type_ = cptBoolean) and (value = 'false')) then
            list.Add(c.Link, 0);
        end;
        iterateConceptsByProperty(c.conceptList, pp, value, list);
  