anchor.diff:                  {title, <<"Scraper target">>}
               ]}
           ]},
  -        
  +
           {predicates, [
               {hasscraperrule, [{title, <<"Scraper rules">>}], [{scraper, scraper_rule}]}        ]},
   
  
positive.code:     Prefix = <<"Itemprop: ">>,
      Suffix = <<" (content attribute)">>,
      <<Prefix/binary, Prop/binary, Suffix/binary>>.
      
  make_itemprop_rule(Prop) ->
      Prefix = <<"string(//*[@itemprop='">>,
      Suffix = <<"'])">>,
      <<Prefix/binary, Prop/binary, Suffix/binary>>.
      
  make_itemprop_attr_rule(Prop) ->
      Prefix = <<"//*[@itemprop='">>,
      Suffix = <<"']//@content">>,
      <<Prefix/binary, Prop/binary, Suffix/binary>>.
  
  
negative.code:                 automatic_scraper_rule,
                  make_itemprop_attr_rule(<<"priceCurrency">>, <<"text">>, <<"price_currency">>)
              },
  
              {bol_scraper_target, scraper_target, [
                  {title, <<"Bol.com product page">>},
                  {url, <<"http://www.bol.com/nl/p/withings-smart-body-analyzer-weegschaal-zwart/9200000013728054/">>}
  