anchor.diff:  .El
   <% end %>
   <% end %>
  -.El
   <% end %>
   <% end %>
   <% end %>
  
positive.code: .Pp
  <% end %>
  <% end %>
  .El
  <% end %>
  <% unless section.attributes.empty? %>
  .Ss Attributes
  .Bl -tag
  <% section.attributes.each do |attribute| %>
  .It Va <%= attribute.name %> Pq <%= attribute.rw %>
  <% if attribute.described? %>
  <%= attribute.description %>
  <% else %>
  
negative.code: <% end %>
  <% unless section.constants.empty? %>
  .Ss Constants
  \&
  <% section.constants.each do |constant| %>
  .Ss Dv <%= constant.name %> Li = <%= escape constant.value %>
  <% if constant.described? %>
  <%= constant.description %>
  <% else %>
  