xml_stylesheet_pi() private

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# File lib/rss/xml-stylesheet.rb, line 13
    def xml_stylesheet_pi
      xsss = @xml_stylesheets.collect do |xss|
        pi = xss.to_s
        pi = nil if /\A\s*\z/ =~ pi
        pi
      end.compact
      xsss.push("") unless xsss.empty?
      xsss.join("\n")
    end
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