anchor.diff:                  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/">>}
  
positive.code:                 {title, <<"Scraper target">>}
              ]}
          ]},
          
          {predicates, [
              {hasscraperrule, [{title, <<"Scraper rules">>}], [{scraper, scraper_rule}]}        ]},
  
  
negative.code:     Prefix = <<"Itemprop: ">>,
      Suffix = <<" (content attribute)">>,
      <<Prefix/binary, Prop/binary, Suffix/binary>>.
  
  make_itemprop_rule(Prop) ->
      Prefix = <<"string(//*[@itemprop='">>,
      Suffix = <<"'][1])">>,
      <<Prefix/binary, Prop/binary, Suffix/binary>>.
  
  make_itemprop_attr_rule(Prop) ->
      Prefix = <<"string(//*[@itemprop='">>,
      Suffix = <<"'][1]//@content)">>,
      <<Prefix/binary, Prop/binary, Suffix/binary>>.
  