app/views/search_results/_header.html.erb
<%= page_header :title => t('txt.views.search_results.header') %>
<% if @results %>
<%= content_for :head do %>
<link href="<%= rdf_search_path(request.query_parameters.merge(:format => :ttl, :lang => nil, :page => @results.current_page, :only_path => false)) %>" type="text/turtle" rel="alternate" title=""/>
<link href="<%= rdf_search_path(request.query_parameters.merge(:format => :rdf, :lang => nil, :page => @results.current_page, :only_path => false)) %>" type="application/rdf+xml" rel="alternate" title=""/>
<% end %>
<% end %>