def extents
      extents = @nodeset.search('.//xmlns:extents').first
      Placemaker::Extents.new(extents) unless extents.nil?
    end
def extents
      extents = @nodeset.search('.//xmlns:extents').first
      Placemaker::Extents.new(extents) unless extents.nil?
    end
Returns a Placemaker::Extents object that is a container for the the map extents covering the places mentioned in the document