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:         {rule, make_itemprop_rule(Prop)},
          {property, PageProp}
      ].
  
  make_itemprop_title(Prop) ->
      Prefix = <<"Itemprop: ">>,
      Suffix = <<" (visible)">>,
  